[Rotary Freak]

As far as batteries go, I think just about any kind will work fine, I suggest a set of Energizer rechargables, they've never done me wrong. Just anything but plain old Alkaline batteries should work out just fine for you. If you want to be really set, get a set of Energizers and their charger, because their charging base will handle both AAA's and 9V's (not at the same time though..I'm sure you knew that.) That way you wont have to worry about either power sources for quite some time.