Batteries are pretty run of the mill. Get variable voltage, period. Aside from that you just want durable ones that don't lose battery life quickly, that's all you should really pay attention to in the reviews. You don't need to worry about throat hit and stuff with a variable voltage, because you decide how much you want.
Everyone that uses ecigs should have a good passthrough. Here's my fave:
http://www.litecigusa.net/Variable_V...iable-pass.htm
You also need to have a good usb adapter, make sure it can do at least 2.5 amps.
There are also batteries that work as passthroughs when plugged in. Good stuff as long as you get a durable one.
I can't find the tanks I use, but they're still not quite perfect anyway. If there's any you're looking at toss a link and I'll check em out.
As to cartomizers, just your basic cheapo Boge low resistance ones work great.
This is my juice, I vape it pretty much exclusively: http://www.litecigusa.net/product_p/dmint30ml.htm
It's kind of a natural tasting mint. I'm just hooked on it, no other mint does it for me, and I get sick of non-mint flavors pretty quick these days.
Getting close to 2 years not smoking regularly, and approaching a year without a single cigarette.
The advances in technology they've made in these things just in the couple years I've been into em are astounding.