Hello! I am searching for a Harman Kardon receiver and have been looking at the 110, 120, 125, 210, 220, 225, 310, 320, 325, 510, 520, and 525. For economic reasons, the 525, 325, and possibly the 520 are out of the question (I would like to find something preowned for less than $300 if possible). So, I know that all of the '25 series receivers use 24bit, 192khz processors and have Logic 7 and a few other odds and ends, and I like the idea of 192khz processors. Do the '10 or '20 series have 192khz? Personally I could care less about 6.1 or 7.1 channel surround sound, so any of these receivers will suit my output needs. I would appreciate anyone's thoughts on which receiver might be best or what separates these receivers from each other. Thanks!