adcom GFP-750 or aragon 28K

anyone owned/heard both-I'd like to hear your opinions on which is the better preamp

I own the Adcom 750 preamp. I haven't heard the Aragon. I can only tell you the Adcom is an amazing preamp. It sounds very natural. It doesn't add its own sound, like some preamps do. It just sounds very natural. Its one of the best preamps.
I've owned both of these preamps, and I think the Adcom is the better unit, particularly if you buy it used. Even if you pay full retail price for a new GFP-750, you get truly excellent value (cost-to-performance ratio).
I agree with SDcampbell and Twilo I sold my GFP750 and
I regret it,big time.Biggest mistake I made.