Hi guys I'm about to buy my first replaceable battery mod so that shows you how much of a newbie I am! Until now I have had a joyetech egrip and an innokin cool fire IV plus. Any I've been doing some research and am looking at Samsung 25r5's and possibly a nitecore i2 or i4. Anything else I should consider? Also where do you guys shop for reliable batteries?Looking for a good site for these and a carry case. Thanks so much. You guys are the best.