Buy Magneplanar MMG's ($600)....FAR better than anything close to the price

However, the Magnepan MMGs like adequate power and most $400-500 integrated amplifiers are going to come up short. If you stick with the PSBs they are more efficient and such integrated amps should work well.

Also look at the:
NAD C326BEE
Cambridge Audio 350A
Music Hall A15.2

You also might be able to live with a Harman Kardon HK3490 stereo receiver. That would work well with the MMGs.

You could also find used with 4+ years transferable warranty remaining Emotiva USP-1 and UPA-2 for maybe $600.

The PSB Image B5 or B6 on good stands would be nice, but if you like realistic bass you might consider the T5 or a subwoofer. PSB SP-25i Speaker Stands can be found here for $80/pair:
http://www.saturdayaudio.com/picturepages/PSB_ALPHA.htm