Hi, I have come to the conclusion that I should probably upgrade my rig a bit. I'm running a 200w Fender BXR200 and a Hartke 4x10XL, rated for 400W @ 8 Ohms. After consulting a few folks around here, I have found out that I'm really not getting much bang for my buck. The questions are - what kind of amplifier can I upgrade to that would best utilize the cab's capabilities? What sort of amplifier can give me the best tone and volume for this cab? Also, I notice some amps are rated for 400W at 4 ohms, 320 at 8 ohms (totally arbitrary numbers here). Would I just buy an amp that would actually be rated for say, 580W @ 4 ohms, 400W @ 8 ohms (again, completely arbitrary numbers)? Thanks for your help. And again, the numbers in the previous paragraph are totally made up and probably unrealistic.