I agree with twodolphins, IF you're buying new. However, if you're buying used, you can do it and get all those things he mentions along with killer bass. I also, agree with him about buy once for quality and sound, and don't have to go through the hassle of buying and selling over and over u until you get lucky.
Read reviews online along with the Audiogon Forum about amps you might be interested in to get the strengths and weaknesses of different amps. I did all that and then found a seller with the Nuforce Ref 9 V3 SE mono amps. We agreed on a price and I loved the sound--it was a very good upgrade from the previous Bryston 8B and Edge M6 amps I had before--both bought used, one for $1500, the other for $800. The cheaper buy of the Edge sounded better than the Bryston. Both those amps were $3000 amps when new. Soundwise, the Nuforce was much more detailed, transparent, dynamic, and still very musical. That's the reason I had Bob Smith at TDSS do the upgrades to it. He said the amps would be MUCH better in all ways as part of the upgrades was beefing up the power supplies. I could have lived with the standard Nuforce amps for along time, too, but after the upgrades, I know they will be my last amps.