While i have no idea of the type of load that you are driving, personally, i would remove the two B&K's from your list. The newer B&K's are not in the same league as the other amps that you have listed.
Depending on the type of load that you are running and your personal preference in terms of sonic characteristics, i like and would recommend either a Forte' 3 ( Nelson Pass design with 200 @ 8 / 350 @ 4 ), a Forte' 6 ( later PS Audio design with 200 @ 8 / 350 @ 4 ) or a Robertson 6010 ( 200 @ 8 / 400 @ 4 ). The Forte' 3 is more delicate and airy sounding than the 6, which tends to be a little rounder and full-bodied sounding. Both amps are somewhat load sensitive, work better into low impedances and should be left on 24/7. Either can be had for between $350 - $600, depending on condition and specific model ( 6, 6A, etc... ).
The Robertson is a good combo of the two with better bass definition and impact while retaining a good amount of the air / speed of the 3. They are typically more money than either of the Forte's though and much harder to find. Also much more money to ship as they weigh something like 60 - 70 lbs rather than the 30 - 35 lbs ( give or take ) of the Forte's. It is NOT a handsome amp and looks rather industrial though. The beauty lies on the inside and what comes out of the speakers when using this amp.
The older Electron Kinetics aka "Eagle" amps are also nice sounding pieces for the cash and are pretty well built.
All of these amps are "fast" aka "wide bandwidth" designs and can be sent into oscillation when running "wide bandwidth" aka "capacitive" speaker cables like Goertz, AudioTekne, Polk, etc... As such, if you are going to use a speaker cable like this ( and i recommend it ), PLEASE use some form of impedance compensation ( Zobel Network ) at the speaker. Sean
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PS... All of these amps are biased quite high. As such, they will run hot at idle. If you get one that doesn't run hot, it is out of bias and will sound like crap.
