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
@glennewdick
If your just starting out I would not start by opening your pre-amp and taking a soldering iron to it (sorry chakster).
The preamp is already torn down. I am in the middle of cleaning, inspecting, and replacing any bad caps. The SP-4 has 2, actually, it has 3 phono inputs, 2 MM and 1 optional MC
I think what chakster is trying to say is, on a budget and just starting out optimize/play with what you have, keep the money to a minimum. Who knows I may hate the sound and never use it.
Get rid of that SP4! A bad sounding SS preamp - and an embarrassment for ARC! Get an SP6 instead - all tube and still a contender against today's multi-kilobuck preamps! I OWN one - a TRUE classic from the Bill Johnson era!
MC cartridges beat MM and MI cartridges for sound quality and information retrieval from those vinyl grooves - contrary to what the untutored say! My experience goes back 40 years! Limited budget? Try the Denon 103R on your Pioneer - I have the same setup! 
Your sp-4 is fine. I’m sure sounds great in your system. And good for you having to know how to replace the caps and take on the soldering with the resistors. It will probably take me a month of reading and YouTube videos before I took on such a task. Really anxious to hear how your project comes out and what phono cartridge you go with. I love a good mystery!