Bottom line, as been said by many experts, speakers will be the reveal as the last link in the chain. NO major amp will make poor speakers sound good and the speakers you like should be you first priority, Relatively, there is really no such thing as a bad amp as they all pretty much put out the same ranges. There will be nuances in clarity, how soundstage is presented, etc, but the key as I said is speakers. I have $50 amps that with the right speakers sound amazing and I have 1000 dollar amp that cannot make bad speakers sound good.
The key is your speaker budget, what type of sound you like, etc. and these days, its alot easier to get amazing speakers at low cost vs the 70's --> 90's
I recently was floored by the sound of some bookshelf speakers I have been testing (I am a tower guy) and just cant beleive the amazing sound they can pump from these little boxes. Check my review in spekers on the ELac;s and the JAMO's...