I bought the GK RB400/210 today. I was able to get a cool sales rep at the Guitar Center here in Miami to get me one shipped over to audition it. I mean, at Sam Ash they wanted me to put 20% up front just to get it to the store, but that was a story for another forum. Anyway, I was able to try a good variety of similarly priced combos but not the Ampeg 2x10. The GK sound impressed me and it's not too big for my bedroom. I think it meets and exceeds my expectations. VX3500.... what was I thinking?