MC cart, can I use MM phono preamp?

No. I have a $2200 phono stage and have just bought one the cost $3500 in 2005 and none of my cartridges cost over $400. You can't hear a $1000 cartridge to advantage through a cheap phono stage. Try a Pro Ject Tube Box SE 11 or a Blue Circle basic phono, I am a dealer and I can't remember how to spell them , or something on that level. The table comes first, then the arm, then the phono stage, then the cartridge. Get the first three lined up before buying an expensive cartridge. If you start at the other end your expensive cartridge may be worn out before the rest of your system is at a level to really hear it.

Yes, but you will need to amplify the signal. Low output moving coils have 1/10 or less the output of typical MM ones. High output MCs are often usable directly into MM inputs. The Denon 110 is a good example available at a good price/performance ratio. But even the High output ones have lower output then MMs. Why does anyone bother with MCs then? The majority of audiophiles think they sound better, not everyone agrees but most top end audio systems use MCs, check members systems for confirmation. There is no answer to your question, it is solely a matter of taste. If you want to go with MC get something like the Bob's Devices step up transformer I use, it is about $395 and will enable you to use your present MM stage with MCs. Or get a top current MM like an Ortofon or Audio Technica 150 ML? I forget exact designation but it available from one web seller for $299. Or Raul and others will tell you to get a leftover MM from bygone days like one of the NOS Ortofons available on Ebay. All of these are reasonable approaches and any, executed with care, will give you good sound. Go to Vinyl Engine and Audio Asylum and do some reading before deciding.