If you are looking for something easy to use, durable, and not too expensive, I'd recommend the IPV-5. It's a two battery mod, it has TC mode for if you want to use it, and it's a... forgiving mod (I'm clumsy, drop it frequently, though now that I'm vaping exclusively, that is happening less, it seems, I guess I'm paying more attention, heh). That said, it's pretty much ugly as sin. I use a Nautilus 2 tank on it, but I've used sub ohm (cleto tank) on it also, and it handles great. That said, if you are building your own coils? I don't know how well it performs with that... I can only recommend it as a very simple, usable mod.
I'm not a big believer in "kits" even from the beginning.... Everything is so varable these days, it's good to have a couple mods you like, and a couple tanks and whatnot. But, I'm not the best advisor here, I haven't tried every new setup from the last 7 years... You could check out some reviews, but ONLY with the caveat that they're demonstrating reviews, so you can at least get a sense of how a setup functions and runs, even if they're saying it's the third coming, it may not be, but you can check out any recommendations here that way to get a sense of how the mod and tank perform, before purchasing again.
Anna