which cartridge to buy? so many...

An Audio Note IQ-2 is a OEM version of the Goldring 1042, and can usually be found for less than the Goldring. If you could find a inexpensive step-up transformer for around $100 or less, you could get a Denon DL103R low-output MC cartridge, and really get cookin'!
Another possibility is the Audio Technica OC-9, if you could find it sufficiently discounted, or the Ortofon X5-MC.
And don't forget the Denon DL-160 as a possibility. It is high output.

For the money, the Ortofon X5 is really hard to beat ($115 from Hong Kong). For rock music you might want to try a Stanton, too.

Be sure to use a cartridge compatacble with the Rega. Dynavector is one of several that works well with the rega. Many people say that Grado has hum issues with Rega. You might also want to stay with a MM cartridge with the Rega 2.

Dynavector 10x4, no question.

thanks for the reponces so far, i do in fact have a bit of a hum problem with my grado, i always have. i just assumed it might just be the normal noise on the record. all my friends have pretty cheesy setups, so i dont have much to compare it too-