I've been using Boge 3.0 single coils for cartos. I understand it's been a crap shoot lately whether you'll get real ones or poorly made knockoffs but I've been lucky so far. The real ones should have one condom longer than the other and should be pretty tight.
If you're looking for function over appearance, I recommend the Vivi Nova as a decent "rebuildable" tank. Insanely easy to fill and the head is cheaply replaceable or even rebuildable if you'd like to give that a shot. It's not ugly but it's not one of those sandblasted Pyrex jobs either.
Atomizer - Phoenix RA (aka Bulli I think). Best one on the low cost side I've tried yet. It looks decent on the ProVari too.
SmokTech has come out with an RA tank that I'm liking a lot too. Haven't modded it to get it perfect yet, but it's not bad out of the box so far. Looks a lot like a regular DCT like the one you got from ProVapes.
I haven't found the need yet to spend $100+ for all the fancy, attractive stuff and really doubt I will. I won't talk bad about any of that stuff as I'm sure it's really good quality gear, but my needs just don't get me to that point. More of jeans and T-shirt vs. Armani suit thing to me.
As far as juices, the sky's the limit on answers/opinion for that. I would advise getting samples from several and go from there. ECBlends sells 5 ml sample bottles for $2.50 for example. Most of the better juice vendors do something similar.
A lot of people DIY juice for pennies per bottle too if that interests you. It interests me but I've yet to set out on that little adventure no matter how easy everyone tells me it is.
There will likely be several more to come along soon with more great advice.
Good luck on your journey!
