Just got my new sliver bullet in today. All I have is Trustfire batteries right now, but I really want to get some new ones. What's your take on the AW IMR 1600mah, or the AW 3100mah? I imagine either would work great, but the 3100mah is double the price of the 1600mah. Is there enough of a difference to matter? I've been runnig a 1.25 ohm dual coil tank on it.