Integrated McIntosh vs. separates

I've been using the amp section of a McIntosh MA6500 integrated paired with a McIntosh C220 preamp for the past year. The integrated is a friends who now wants it back so he can sell it. So, I'm looking at something like a McIntosh MC150 or MC300 to replace it. Will I hear any improvement? My other option is to buy the MA6500 from my friend knowing I can always use it as an integrated if needed. I'm leaning towards the separate amp. My speakers are Dynaudio Special 25's. Or, any suggestions on other amps that would be a good match for the C220 in the $1500-2000 range, used or new.