I need help. I am new to vaping, and in 3 weeks have spent quite a bit doing the e-cig thing. So, here's my question (background on my set-up first). I have a Riva 510 750mah, 3.7 volt, and an ego, same specs. I have been through filling carts, cleaning atomizers, etc. I have read that a lot of people like cartomizers. I can understand with the mess and hassle of the 3 part systems. I would like to order a few to try. I just can't decide what I should order. I have read about the new dual-coil low resistance cartomizers, even the new echo ones which are very scarce at present. Should I just try some standard ones? How long do most of these last? Are they hard to clean or reuse? How hard are they on your stock batteries (trying to keep things working for as long as possible, with the least amount of headaches and hassles). Since I am the guinea pig for everyone I know who smokes, I need help to learn the best, and pass on to others so they can give the e-cig the proper try it deserves.