This may sound wacky but someone I know has a Audio Technica 120e (which can be gotten for $54 online thru garage-a-records) with his Rega3 and it sounds phenomenal. Most Audio Technica's cartridges sound awful on the rega but this one works well. He's also got his table on a target wall shelf which I'm sure plays a big role in the sound. Goldring Eroica (high output version) I remember sounding good on the rega but it might be more than $300, anyway it's around $300. Sumiko pearl (around $100) is supposed to be a good match but haven't personally heard the combo.
