NAD, Parasound, Emotiva and Adcom all make good budget amps. The Emotiva and Parasound are naturally a bit bright so choose your DAC's wisely. The Tube Preamp will help with this as well. The Adcom range is a bit more neutral in tone and has a big soundstage.
I have no personal experience with NAD.
When picking a solid state amp try to find the one that weighs the most so you know it has the balls to back up the spec sheet.
When picking a solid state amp try to find the one that weighs the most so you know it has the balls to back up the spec sheet.