Phono preamp worth it with MM cartridges?


I've had conflicting advice from dealers so hoping for some clarity here. How much do phono preamps offer with sound quality and MM cartridges? (I understand they have a huge impact on sound quality with MC). 

My current setup is Rega P3/Neo/Exact/Groovetracer RS, Rega Elex-R amp, and Spendor A4 speakers and I mostly listen to classical, jazz, and light rock.

Will buying a Rega Aria phone preamp (or  iFi iPhono 3? Avid? Graham Slee? in the sub $2k range) make a worthwhile difference or should I wait till I buy an MC cartridge before splurging ? 

Thanks, Roger
wqgq_641
Chak, I hope you understand that I am agreeing with you about 30K ohms.  Got that?  I personally have found most often that 100K ohms sounds best with many of my MMs.  This started with the Grado TLZ or XTZ which I know we both like. The TLZ sounded best with 100K ohms load.  I have actually never tried less than 47K ohms.  Also, in many cases it's a trade-off with capacitance.  If you increase R above 47K there would be a corresponding change in the best capacitative load.  If you don't want to mess around with C, you can just play with R (more or less) until you get the best result with whatever is the total C load seen by the phono stage.  You don't even have to know exactly the value of C, just change R until you are happy.
No Love for the MoFi Carts?

Seems like the 500 dollar cart range is just as packed as the 500 dollar TT market.
Chakster sold me a very nice AT ML150-OCC MM cartridge that I would be willing to let go if you are interested?  Send me a PM. He highly recommended this cartridge and it is a good one especially at the less than $500 price point. It betters most MM sold today. 
i agree as mm's go the at ml150 is excellent

need a loading kit to make the treble sound right though... it did not like 47k iirc
jjss49 you bring up a good point. I did try a few different settings. What did you decide on worked best in your setup?