Audio Technica AT-110E - the amount of performance you can get out of this is absurd.

Decca Deram - sounds far better than a ceramic ought to!

Ortofon OM Pro S - they cost about £30 each and are meant for DJ use but are surprisingly capable in hi-fi terms. 3-4g tracking weight also means they can be used on older, massier arms.

Ortofon 2M Black - the finest MM I have ever heard that wipes the floor with most MCs up to £1000 or so, IMHO.

Audio Technica AT-OC9MLII - I may have the above 2M Black and a Kontrapunkt b MC (which is also brilliant) but I keep coming back to this one.