Ok, so santa just brought me a Yamaha BB414 and I'm looking to upgrade my amp from my 30-watt peavy Microbass. I need something with more power, more balls, and more tone options. I'm only going to use it in the house to practice and fool around, but I want to be able to shake the walls . Space is definitely an issue. My budget is $400-$500. I'm thinking no less than 100-watts. I'm also thinking combo amp because of the limited space I have, but would love to get a head and cab if I could find a relatively compact setup. What would you recommend?