Trying vinyl, need some help!


For the last month, I have been searching for a good cd player or transport and thought I had settled on a Mcintosh unit when I started looking and turntables. I found a Roksan Radius 5 with a Nima tonearm that was in my budget so I bought it.
Now comes the problem, the cartridge. There are so many to choose from and they are not cheap so finding one that would compliment the table/arm is a bit intimidating.
My Audio Research preamp has 2 inputs for MM, or I can purchase a dedicated MC preamp.
If anyone has any experience with the Radius 5 please let me know what you have tried.
drf24
I guess I should have said what my budget will allow, I would like to stay under 600 if at all possible, cartridge and preamp if needed.
I have read so many older posts about the Roksan and Nima arm and haven't seen a common cartridge. 
Why not just stay with MM phono stage, but upgraded it to 100k Ohm with Vishay naked Foil Resistors? You can use some of the best MM cartridge with your phono stage without any needs for an MC and MC phono stage. Loaded your MM cartridge with 100k Ohm you will get an amazing sound quality compared to standard 47k Ohm. The cost of this upgrade is nothing. Those resistors available from Texas Components (USA) on ebay. This is the best resistors for audio available today. Highly recommended! 

BTW with your budget you can buy some killer MM from the 70s/80s era, something like AT20SLa or Grace F9