Such hard decisions :D Anyone with some insight on Amp Selection?

Alright, so here's the lowdown, i have deftech BP-30's powered by  my adcom gfa-5500, center and surrounds powered by TX-NR838 onkyo receiver, i am upgrading my infinity center channel to the deftech CLR-2000 so the sound signatures match my BP-30s, i dont really want to power the center from my receiver anymore, so was looking into 3 channel amps, i stumbled across 2 local to me 

adcom GFA-5503 or the B&K Reference 4430 - both around 400-500$

seems the gfa-5503 will be basically the same thing i have now with a 3rd channel, and to be honest i am happy with the sound, but not sure if i am missing anything by not trying out the B&K, are they kinda the same class or is the B&K outclassing the adcom (does it sound better to MOST people, i know sound is subjective ;) ) 

i guess just searching for opinions/advice since i dont really mix/match amplifiers.  I did do a lot of research and its hard to pinpoint where my decision should go as there is no DIRECT comparison between the two i could find lol.  Thanks in advance, and if i am saying anything stupid be nice, new to audio forums ;) 

Full setup:
TX-NR838 receiver, also used as dac/preamp
Adcom GFA-5500 powering R/L speakers
Definitive Technology BP-30 FR/FL
Definitive Technology CLR-2000 Center
random monoprice RR/RL
Subwoofer - Sunfire TS EQ 10 Signature
Debut Carbon Turntable.