Advice on an external Phono stage

Can anyone offer any advice on choosing a phono stage? It needs to be easy to switch back & forth between MM and MC.

Current setup is as follows:
KEF R700 Speakers
Cary Audio SA-200.2 Power Amplifier
Supratek Chardonnay Pre-Amp
(tubes are N.O.S. Mullard GZ34 rectifier, RCA 6SN7's and Westinghouse 7581A's)
Garrard 301 turntable 
Thomas Schick 12" tonearm
Cartridges are a Zu Audio enhanced Denon 103 (ZU/DL MK.II), a Ortofon Mono MM and an Ortofon 78.

Any and all reccomendations welcomed!

Thanks,

Jared