I am looking at picking up a power amp and now am debating on whether to consider B&K as well as my original pick of an Adcom 535 or 545. I guess to be in the same price range (used) of about 200 +/- that would be the B&K ST1200 series. Any opinions on which would be best match to the paradigm ref studio 20's. I know it is mainly up to personal preference, but how do the two amps compare?? thanks