I feel that I don't get the full potential of those speakers with this amp, so I would like to "upgrade"What do you feel is missing or out of balance?
Not enough power or authority?
Dynamic contrasts?
Loose of flabby bass?
Rolled off high frequencies?
Too much midrange emphasis, not enough?
Clarity or image focus?
A little more info would really help people understand what you are looking for. There are actually some pretty good choices within your price range.