I have a GameBoy Advanced SP. I am looking for a flash cart to use with it. I've seen people recommending the EZ IV, and was wondering if that is the one to go with. I don't need it for slot 2 since I have a EZ 3-in-1, just need it for the GBA. Is the IV the way to go? How good is compatibility? Also, where should I go to get one? http://www.gameyeeeah.com/ezflash-iv-minisd-p-55.html This is where I'm looking now. Thanks for your help!