hi. check out this thread:
http://www.whathifi.com/forum/hi-fi/budget-floorstanders-amp-audition-list-and-results
the Rogue Audio Sphinx seems like a well thought out decision. If that's too expensive, my ears would be set on Naim Nait 5si. If that one is also too much, then the awesome XTZ A100D3 - but only if you don't need to use headphones.