Hi fellas, I'm beginning my quest on the right DB rig for myself in the future. After reading many different threads about the AI and EA amps & cabs, I think I've settled between the iAmp500 (or maybe a Clarus 2 for the 2nd channel). The iAmp500 sounds really good though. Mainly cuz it has a lot of power and I need the feature of being able to use headphones along with an external input (like a cd) to practice (from what Bob G's site says). My intention is to put the $$$ out in the beginning instead of upgrading later on. The iAmp500 should give me the flexibility I want with different cabs along with great sound. EDIT: I currently am running an underwood pickup, but will consider switching to a mic later on, or even switch back and forth depending on the application. What I'm confused about is the wattage and resistance equations to pair up the head with a cab. Wattage is how much power is going to the amp, no? So if for a given amount of resistance (say 4 ohms), will the 500 watts be too much and blow out a 250 watt cab? Or rather, will I damage the cab by underpowering it (like a 100 watt head into a 250 watt cab)? I saw another thread discussing this sort of thing, but there were alot of variables being thrown around and it got confusing. Ideally, I'd like to pair the 500 with a wizzy cab or a 1x10 cab for regular small stuff and still have the option to go with a bigger speaker later on. Thanks for clearing up my ignorance.