bryston, adcom, or parasound. bryston has the best warranty in the business (20 year, fully transferable). Any of those three would be a decent stopping point for a beginning audiophile until your tastes develop and mature. I'd buy used ones. If you keep them in good shape you should pretty much be able to recoup most of your initial purchase price come time to sell.
Also consider the Krell KAV-300i intergrated amp (preamp and power amp in one) for about $1000 used.
Also consider the Krell KAV-300i intergrated amp (preamp and power amp in one) for about $1000 used.