I am thinking about putting one on mine.  SWFA is running a deal where if you buy a Leupold scope over 299.99 you get a crap load of accessories.
http://www.riflescopes.com/popups/leupold_popup2.asp
I think that is it.

But to the point at hand, who makes a good mount for this task?

There are several mounts to be had-

The Brugger & Thomet low mount- B&T mount at DSA

The Original Mount from H&K-Robert Johnson HK Parts

A well made copy of the original mount by Tapco-Tapco HK mount copy

I have the Tapco one and it is well made...not the airsoft crap that some are selling, but a cast then machined part...unless you are going to use STANAG rings, you will need a rail for the rings.

I have a buddy that is getting the B&T mount from DSA..I will report back on that one...

The down side to a H&K mount/copy, is that the mount is high......the B&T mount is supposed to set lower...

Quoted: The G3lowmnt sold at FAC is nice, but too short to mount anything but a compact optic far enough fwd. If I do it again, B&T.

You know I almost bought that mount until I read that...I'm glad I didn't....

Get an ARMS G3 Claw mount for it.