I was in your shoes about 2 weeks ago. The options can make your head spin. As pretty much everyone said, pretty much anything is a step up from the Blu disposables. I used them for a few days at work, and they served their purpose, but I knew it wasn't a long term solution.
I bought a Halo Triton starter kit. Also bought several 7ml sized juices and some blank cartomizers. Couldn't be happier. From my limited experience...
They seem big, but they're not. My Triton with tank is about the size of a sharpie marker. The diameter is the same size as a AA battery. It's not heavy. It's slightly longer than a Blu disposable. If you can easily carry a Blu disposable, the difference between it and the Triton is pretty much negligible.
There's so much more flavor, vapor and throat hit.
Don't try to get the same flavor as your cigarettes, as that'll be a endless and unneccessary battle.
I didn't think I'd like sweet and/or flavored juices. Tiki Juice to me tastes like cherry coke and vanilla. It's my favorite. HX3 tastes something like a slightly tobacco flavored hazelnut. My second favorite. Menthol Ice tastes more spearminty than menthol, but that's my work flavor and somehow the most satisfying vape. No idea why it's the most satisfying, but it is.
The Blu disposables are 24 mg of nicotine, so I went with that strength. I feel more of a nicotine buzz, so I don't vape as much.
The pg/vg ratios are confusing. I bought the Halo juices to keep it simple, as there's no option in that regard and I think each flavor has its own ratio.
I thought filling juices would be a pain in the rear end, but it's very simple; simply unscrew the top of the tank or
or pull the cap off a cartomizer and drip some liquid in. Takes a minute or so.
Tanks are so much better than cartomizers. Better draw, far more flavor and subtle flavors coming through, and you can see exactly how much you've vaped and need to refill. With a cartomizer, you have to guess.
Tanks aren't any less durable than cartomizers in my limited experience. They look fragile, but I've kept them in my pocket all day at work with no issues.
I went with Halo due to its hardware and juice reviews, and it's a one-stop shop for me. I'll try juices from other vendors eventually, but I'm still keeping it simple.
This isn't a Halo ad. I can't say they're the best, as there's really no one best thing for every single person and I haven't tried anything else.
At the end of the day it was a bit of a leap of faith with buying what I bought. While there's differences between the Triton and eGo stuff, I don't think they're night and day if your comparing comparable items. Halo didn't give me anything others vendors weren't, and I didn't see others vendors giving away anything Halo wasn't.
My best advice is keep it simple, get a true sense of what a basic setup (above disposables) can do for you, then fine tune it after you've sorted out what's what.