Integrated amp with mc-phono.

Densen B100 with optional MC phono card added would be under this budget. I own one (without the MC card) and I like it a lot. However I know from your posts you have a pretty nice system so I'm not sure if it would be up to your standards. Also they're hard to find in the US.
www.densen.dk
Other thoughts are Creek5350, Naim Nait5, Cyrus7, Arcam. All have optional MC inputs, though I don't know the sensitivity. I expect Linn has something, but I have no experience with their equipment.

Unison Research UNICO 80WPC Hybrid Integrated Amp with optional MC card ($1395) to drive very low output MC cartridge (0.3mv). http://www.vmaxservices.com/home.html

Plinius offers this Int. Amp with either mm or mc. 175Watts/ch. Used ones are in your price range.

Why limit your search for a preamp with a mc input...
There are so many outboard mc phono stages that can be added to most preamps... Usually these phono pres are much better than the phonostages in higher end preamps...
Check out products by Clearaudio, Monolithic or Musical Surroundings...Check out needledoctor.com
Good luck,
Joe

try the McIntosh int