I too have the Studio 1s, and they continue to amaze me, even 10 years later. In that time I have gone from a Carver receiver to a Pathos Twin Towers/Meridian 508-24 and they have managed to keep in step the whole way (they're even better if you remove the plastic covers from the tweeters!). I agree, you really can't go wrong with ProAc. If you can stretch just a bit, I have heard the Response 2s's which I've seen used for around $2000, and that would be a great step up.
