I'm in same boat. The ipv v2 mini(about $50) wouldn't be too bad of a choice but sigelei and ipv got some new tempature control mods coming out. Sigelei has a 75w single 18650 device on the way, it might be out already I don't know for sure.
There is the ipvd2 it's also a single 18650 75w temperature control device. I think this one is available for pre order.
I believe these newer temp control devices from sigelei and ipv are both around the $60 to $75 price range.
I've heard good things about the joytech vt, it wouldn't be a bad bet either. It's paintjob looks damn good, nice bright screen, even comes with a tank. 60 watts and a 5000mah battery. That's a good amount of battery life. I personally don't like internal batteries I prefer to have easily removable ones for example, say our evic vt runs dead. Now you have to plug it in and wait for it to charge, that's a 5000mah battery, it's going to take a while( I do not know if it supports passthrough vaping.)
With the ipv v2 mini, if you have multiple batteries, you can take out the uncharged one, put it on a wall charger, I have a nitecore something dual bay 500mah charger, and pop a freshly charged battery into the ipv v2 mini and it's good to go, but if your always using it at 50watts+ that single 18650 will die within like 4-5 hours depending on your coil build/how often your vaping.
I was thinking about getting the sigelei 150watt(about $60-$70) because it holds 2 18650's and almost everything I hear about it is good. Slight in accurate readings with a 0.2 to 0.5 ohm coils at higher wattages but with 150 watts I don't think i'll have much of a problem with that.
I'm trying to look more into those newer box mods from sigelei and pioneer4u. I really really like the look of the sigelei 75w temp control. I just want it all black.