I think there are a few amps that are in the 300-600 range that will someone very happy coming from nothing. The Darkvoice, EC/SS, Heed Canamp (there's one on the FS right now for a great price), Larocco PRII, RSA SR-71 are some I know. After that, I think there's another sweet spot in the $1500-2500 range, depending on what you're into and if you can buy used or not. My current main amp falls in this category and it was a huge step from from those I mentioned. I've heard a few mind-blowing amps way above that range, which had systems to match, but that's a sweet spot I'll have to dream about for awhile longer.