MC cartridge?


I recently purchased a Marantz 6110 TT on e-bay for about $70. It has the stock marantz arm and a Grado black cartridge. I sounds decent, but lacks the detail I would like. I am considering trying a MC cartridge. I would like to stay around $300. Also, should I upgrade the arm? If so which one? I have been out of the analog game for a while now and I'm trying to tip toe back in. In a nut shell my question is should I upgrade this table or start over with a better table? Thanks for any advise you can give.

Associated equipment....
Conrad Johnson PV10 with phono
(2) ARC D-130 amps
CAL cd transport
MSB gold link DAC
Nakamichi RX 505 tape deck
Nakamichi CR5 tape deck
Martin Logan SL3
Velodyne FRS 12
All Audioquest cables
tbridges8ce4
...sumiko bps,
...dynavector 10x4,
...clearaudio aurum beta s(it's mm but easily competes with mc for the price offered)
...shure V15 vmxr(which is also mm with great performance and with medium output.

don't change the arm since it's the best and more reasonable to wait for more radical analogue upgrade i.e you might want to change the turntable arround the cartridges choosen.
Definately try the Garrott K2 from needledoctor.com
about 300... awsome mc cartridge..
I use it with the p3, and the sound difference when I upgraded from a mm, audio technica was dramatic...
So much more musical... Great value.
good luck,
joe