I guess my top 4 picks(present lines) would be Zapco, Arc Audio, JL Audio, and Xtant, probably in about that order. There's probably a few, more esoteric brands out there that might be "better" and others I'm forgetting, but those are 4 fairly well respected manufacturers known for excellent sound and build quality.
When you get that high in the food chain there's not a whole helluva lot a difference although most would argue that the A/B amps(Zapco and Arc Audio's top of the line stuff) would sound sweeter, but SQ can be pretty subjective. A/B amps aren't as efficient as class D's and require more power to produce the same output however so take your alternator into consideration before purchase.
Do you have a spending limit? if not Fishy is on the ball as always.
I am selling my mint cond XTANT 1001 amp and still has warranty from manufacture defects. I'm asking 700.00 obo for it. call me (425) 985-5415 or email email@example.com. Believe me you wont be disappointed with this amp. I have posted my sell here with pics if you want to see them, look up XTANT 1001 and thats me.