My Creek OBH 21SE came and broke in on my Cyrus 8SE with PSX and Grado 325's. All Iam going to have for a few years is my cans is this amp sufficent Im not that happy with the sound I can buy a set of Grado PS500 for $650 Canadian but not sure of how much of a upgrade that would be from the 325's. Maybe I should have went for a higher end dedicated head amp, any suggestions my source will remain the same. The Creek in Canada is a 500 dollar unit so it gives up a idea how much the price jumps on this side of the ocean.