I purchased a pair of KH80s for backup use from my main monitors - or so I thought until I heard them. They completely beat my expectations, these are excellent in their own right. I happen to also own a KH750, and with the ethernet connection, is a strong, if different kind of, contender to the KH310 (my main monitors).
It has plenty of punch on its own, and doesn't sound like the small box that it is at all. By this, I don't mean it goes low etc., I'm referring to the depth and breadth of the presentation - it is very robust and believable. I would dare say the spatial information might be superior to the KH310 in my set up.
I have also used the KH120 for a long time before, and feel (ignoring the new KH150s) that the most accurate sound is the KH310, the most modern sound is the KH80+KH750, and the KH120 falls somewhere in the middle (also ignoring the new version of the KH120, which apparently has DSP).
Audition recommended if this (KH80) is a good fit for your budget. I personally prefer them to a number of other excellent monitor manufacturers in the price range. Good luck!