You can't go wrong with anything from NAD, Marantz, Cambridge Audio... the list goes on. For good entry level amplifiers (but by no means crappy) have a look at the Marantz PM5003, Marantz PM6002, Nad C315BEE, Nad C325BEE and the Cambridge Audio 340A (or 540/640A if you can find a good price). I would post some direct links for you, but I'm not sure what the best sites are for Hifi separates in the US.