Hi, I've bought B&W 683s. But am yet to buy the amp and am trying to decide between RA-12, RA-1570 and Hegel H80. I heard a few of them at home with my speakers and I kind of liked the 1570 and H80 amongst them. I like the RA-12 also (especially since it is half the price of the RA-1570!) except that I felt that the 1570 had a tighter grip on the bass (but not sure if its worth paying some much extra for it). Would you guys have any advice amongst these amps? Please don't suggest auditioning any other amps as I would like to choose between these and move on. My listening will be in an apartment and I mainly listed to classic rock and blues.