Credo: Ok, but I'm not sure what to buy >.< Theres a big page of them.
OK, here is some info that might help.
510 threads are a must. Both kits you linked have 510 threads, so you can exchange parts between the kits
Next question is resistance.
With those type batteries, anything from 2 Ohms up to 3 Ohms will work. The lower the number the hotter the vape will be. For future reference, the 'normal or standard' resistance for eGo/Riva batteries is around 2.5 Ohms. Almost always a safe bet. Dropping to 2 Ohms will give you a little warmer vape, and also produce a little more vapor, which is great for your darker and sweeter flavors (tobaccos, coffees, dark-chocolates, menthol, etc.) Cooler vape is sometimes better for your lighter flufflier stuff, and for citrus/fruity stuff. Lower resistances also drain your battery a little faster than higher resistance ones. Don't get me wrong...all of them will work fine with your batteries...just a bit of info for helping decide. I would not go under 2 Ohms or over 3 Ohms with those batteries tho.
Finally decide how much juice you want them to hold.
Most vendors now offer jumbo and giant stuff that can hold as much as 4ml of liquid! For now, I'd stay with the smaller cartos until you find your favorite 'go-to' liquids.
Coils:
Vertical vs Horizontal
Boge and SmokTech use vertical coils. Kanger and Joye cartos, I'm pretty sure use the horizontal kind. The vertical ones extend the length of the carto and the horizontal ones sit at the very bottom of the carto more like a regular atomizer w/cart. The advantage to the horizontal type is that you can often go longer without needing to 'top' the carto (add more liquid). The advantage to the vertical type is that some people report they vape a little warmer and produce slightly more vape (keep them topped and wet for longer life and better flavor).
These days you can get 'dual/triple coil' stuff. With the batteries you've linked above...I'd recommend avoiding those for now. At some point it should be safe to 'try' some of them occasionally, but for regular use....stick with the single coil stuff on those particular batteries. Dual coils use alot of juice really fast, and put a big strain on the battery and switch of your PV. Mods or beefy pass-thrus are recommended for using them.
Brands:
At this point any brand should be ok for you to try. Boge is really popular and a good safe bet for your first set. Joye and Kanger make good cartomizers. SmokTech (single coil) is really inexpensive and should work ok at this point.
Exotic Cartos:
There are now fillerless cartos out there as well. They use wicks and tanks and stuff. The CE2 or Fluxomizer (requires syringes or needle tip bottles to fill), and the G4/G5/Vortex (very easy to fill and use but can be kind of leaky as a 'travel' carto) are examples. All good stuff, but maybe better to try later on when you're more famaliar with your kit and liquids.
For the beginning vapor, trying and finding liquids you like are the most important and more expensive thing
Juice Consumption:
With regular 510 atties and Cartomizers...really heavy vapors ( people that suck on the things all day like a research monkey) often report they use from 3ml to 4ml a day. That gives you some idea of how much liquid to consider you might need on down the road. A normal Boge cartomizer will hold close to 1ml of liquid. So in theory a heavy vapor could go all day with 4 or 5 filled cartomizers. Light to moderate vapors can usually go all day with one or two
