Def don't get the Blu, it sucks. The V2 is okay and some people seem to like it, but it's extremely overpriced so I wouldn't get that either. And I never hear of gator vapor so I would assume their ecig prob is overpriced and very basic too.
Personally I dont recommend getting a slim ecig, a bigger battery ecig would be alot better and you wouldn't have to constantly charge your batteries, but if you really feel its necessary to have it look like a cig, I'd check out the volt, halo g6, or one from vapor4life. They seem to be the ones people like the most, but it's still a slim ecig and they do have limitations. Something with a bigger battery will allow you to use low resistance and standard resistance attys and cartos. Slim ecigs can only use standard resistance. Most people prefer LR cartos bc they give a warmer vape and more throat hit(TH). Using LRs on a slim ecig will ruin the battery. I use an Epower and love it. I wasted a ton of money in the beginning on a crappy slim ecig, and then bought the Epower. Most people pretty quickly realize they don't care if it looks like a cig bc they'd rather have something that performs great. Not batteries now are 1050mah and last a day to a day and a half. It uses non-proprietary batteries like a flashlight so it's very easy to carry around a spare and pop it in if needed. It gives 100x better vape and all I use is low resistance cartos. I use the Ressurector cartos which are 1.7ohm LR which gives a great warm vape and they hold alittle over 2ml so they last a long time before needing a refill. I pop a fresh battery in in the morning and fill 2 Ressurectors and I can go to work and be good and not have to worry about running out of battery or running out of juice. The batteries are about the size of a AA but alittle longer so their small and easy to carry so i always either have a spare in my pocket or car just in case. I also carry around a small bottle of juice just in case I want to top off a carto during the day. With a slim ecig your going to need to have to charge your batteries frequently throughout the day. I also recommend checking out the Riva, and kGo too. All three are 3.7V pVs and have 510 connections which is the most popular and will allow you to use an array of attys And cartos. Alot of people also like the eGo but the eGo is only 3.3-3.4V and I prefer the 3.7V PVs. The 3.7V PVs provide alittle more oomph than an eGo and also work better with the real low resistance attys/cartos like 1.5-1.7ohm. For an eGo I don't recommend using lower than 2.0ohm bc you potentially fry the battery. Alot of eGo users use 1.5 and 1.7ohms and haven't had a problem, but many people have also fried one using 1.5ohms. That's why I prefer the 3.7Vs and I also think the give a better hit. Their all in the same price range and their also similar in size. Really any of them including the eGo would be alot better than a slim ecig. I like the kGo and Epower the most, but the Riva is also a solid PV and you can get it for a great price from LibertyFlights. All of them arnt any more expensive than a slim ecig and alot of the times their actually cheaper! Most of the slim ecigs are grossly overpriced bc the companies that sell them know that the peoe that buy them don't know any better. The kGo comes off the charged ad 4.2V and provides a great vape. It also has an 1100mah battery which will last most people at least a day. The reason I like the Epower more is bc it's the only one that uses non-proprietary batteries. The kGo, eGo, and Riva all have the battery contained inside the unit and the switch is also part of the battery. So if your switch dies or you need to replace a battery you have to replace the whole unit. With the Epower everything is seperate and can be bought individually. So if need a new switch you can replace just the switch and keep using your existing tube and battery. The Epower batteries are also alot cheaper and last longer before they need to be replaced. Epower batts cost $4-5 bucks while eGo, riva, kGo batteries cost $14-20. So that's why I really like the Epower bc it's a lot cheaper to maintain. I also hate that with the proprietary batteries you have to basically carry a second PV if you want to have a spare battery while with the Epower you can just carry a spare battery and if needed just unscrew the switch and pop in a fresh battery. That's just me though and I have plenty of friends that have kGos and Rivas and absolutely love them.
Crystal Clear Vaping also has a great deal on the Epower and you get $25 bucks in free stuff which I liked. You get a free 6-pack of Ressurector cartos, a free 30ml juice of your choice, and free shipping. Plus put in ecf5off and you get 5% off the order. I liked that bc CCV gives you everything you need to get started. The Ressurector cartos are all I use now and they work absolutely awesome on the Epower, kGo, and Riva.
I think you'd really like a Riva, kGo, Epower, or eGo alot more than a slim ecig. I know you might want your ecig to look like a cig, but i really think after you start using a bigger battery PV, you quickly will get over caring if it looks like a real cig or not.
Also I know that Crystal Clear Vaping has a black & mild juice. I got the black & mild juice as the free one when I bought my Epower. It's the first juice that I could vape all day when I started. It is very flavorful and produces crazy amounts of vapor. And they have free shipping which is nice, so you could either order a bottle of that or if you get an Epower you could get the black & mild as your free juice.
Goodluck!