I recently went from a SS class a/b amp (Odyssey Stratos upgraded to Kismet Reference) which died to a class D, Arion Audio S500 for my 2000s. I couldn't be happier.
While I have great respect for John Strohbeen, I disagree with him on a few points. Rather than place my 2000s close to the front walls, I pull them out into the room a bit. I do run them with a pair of Vandy subs, though. Also, while John likes to point out that his speakers sound good with low or mid to fi gear, and they do, IME, they will sound better with better gear. Every upstream upgrade I have made has improved the sound of the ohms, and not in a subtle way. So, go with the best amp you can afford now, but upgrade when you can. I think you'll be glad you did.
While I have great respect for John Strohbeen, I disagree with him on a few points. Rather than place my 2000s close to the front walls, I pull them out into the room a bit. I do run them with a pair of Vandy subs, though. Also, while John likes to point out that his speakers sound good with low or mid to fi gear, and they do, IME, they will sound better with better gear. Every upstream upgrade I have made has improved the sound of the ohms, and not in a subtle way. So, go with the best amp you can afford now, but upgrade when you can. I think you'll be glad you did.