What well known MC cartridges can use a MM pre??

Benz makes most of its cartridges in high output models, the Glider H is quite common used, a new Benz Ace H would also work within your budget. The Sumiko Blackbird sounded quite nice when I heard it at a friends house, you would need to find a used one. For less scratch, the Denon DL-110 and DL-160 are quite nice and pretty common, as well. The Dynavecor cartridges work very well with the Rega arms and are recommended by Harry for the VPI arms as well, the 20H is the high output model that is a step up from the 10X5 and would be within your price range new.

I believe the one that gets like the top spot a lot of the times for price and being a hi out 2.5 mV MC is the Sumiko Blackbird?

Without knowing the gain of your phono stage, you can probably use any MC cartridge whose output is 1.00 mV or higher. That's the only specification you need to know, as far as phono pre-amp compatibility is concerned. Good luck, Dave

I think Dopogue has it basically right, but since the M3A has only 28dB of phono section gain, I would raise the limit to 1.5mV or higher ;--)

The thing about the very high output MC carts. like the Blackbird and van den Hul TWO, is that they are designed to plug and play straight into the default 47Kohm load of MM phonostages. And so they sound great right out of the box.

Other HO MC carts are at somewhat of a disadvantage sonically unless their owner adjusts the phonostage input impedance to match them properly. As long as 25 times the cartridge's impedance (or internal resistance) equals 7500ohms or more, the default 47Kohms should be fine.
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Oops. Forgot about the 47Khohm issue. And I didn't know the M3A had so little phono gain. Trust Ngarch here.