$1,500 to spend on a tubed full function pre

With your Cosmos, I'd get the Kora Eclipse pre and call it a day - and a very good match! You'll have to spring for just a bit more than the $1500 you mention, though. The phono stage portion (SS), in my opinion, is at least equal to the EAR in sound quality and will allow both MM and MC. About as full-featured as a pre gets, too. Make sure you find one with the newest internal features - Auricaps and Jena labs silver wiring - some try to peddle older versions at the same prices and the newer versions are DISTINCTLY better. Roll some good NOS tubes and you will really like the Eclipse with that Cosmos.

If you can stretch, there's an Air Tight ATC 1 out here for 2K. I have one and it's a great sounding preamp with a MM phono stage using 3 12ax7's.

The Rogue 99 Magnum is great, there are tonnes of other pre's out there too which I haven't heard also. I've owned the 99 and it worked well in my system and also in other systems I've tested it in.

A used Counterpoint SA-5000, if you can find one. The Audible Illusions pre's may also fit that description.

Phild, I second the Audible Illusions suggestion.