I will be probably buying one of three amps. An Onkyo A-9555, or either the Yamaha A-S500 or A-S700 integrated amps. Onkyo also integrated. All seem good candidates. Can pick up the Onkyo @$300, the A-S700@$350, and the A-S500@$400. (Yes, found deal on the larger Yamaha less than smaller one).
On Polk product pages the A1's get slightly higher user reviews than the A3's but both got excellent critic reviews. Product page on the A3's say something about bookshelf form factor with tower sound I think.
All this going into a bedroom, I guess avg size. No high volumes needed but want to run amp/speakers at "normal" levels to classical mostly, some Internet radio from my Mac, and lossless music from the Mac (eventually passing through an HRT Dac).