Advise on used 1k to 1.5k pre-amp

Any thoughts,comparisons or recommendations regarding;
Mark Levinson 38
vrs.
Conrad Johson PFR
vrs.
Krell KRC-3

I'm considering these 3 used units as well as a new Adcom GFP-750.(is this like throughing in a Chevy against a bunch of Mercedes or is the Adcom a worthy opponent to these?) All I really care about is sound quality and reliability. Aesthetics and name brand recognition are totally secondary.

Thanks

Steve

I have been considering the Adcom GFP-750 due to it's high praises, low cost and Stereophile "Class A" rating. I do however have some concerns.

1) Is this unit really as good as some make it out to be...The reviewer at Stereophile said he couldn't hear much difference between the 750 and a $6,000.00 Mark Levinson. Is this just concern about generating advertisment revenue or are Stereophile's opinions to be taken seriously? How much weight should be given to Stereophiles "Class A" rating?

2) Would the Adcom be a good match for one of my leading speaker candidates; Thiel 3.6 ?

I'd really like to get a pre-amp that I'm not going to be itching to upgrade in a few months or a year. My main concerns in searching for a pre (other than sound) are;
1)solid state
2)remote
3)Home theater integration(pass through desireable)

Anybody have an opinion on the Krell KRC-3. I've heard that it sounds very smooth and is quite different from other Krell products. Never having heard anything from Krell I don't know if this is good or bad.