Does your engine happen to be a YSM12? I just purchased a West by North Campbell Sailor LH 3-blade fixed prop for my 1979 Hunter 30 with the YSM12 (
http://www.westbynorth.com/). Unfortunately I've been having engine issues and haven't really been able to try it out. I posted a similar question to yours on the Hunter Owner's forum and got several recommendations for this prop. I spent close to $600 including shipping, and they were able to make it in a few weeks. Supposedly it's an excellent combination of good thrust, low propwalk, and low drag. I will say that I still have significant propwalk. Like Greg says, if you call them and give them your engine info they figure out a good prop. And if it doesn't work well they can re-pitch it (of course you have to send it to Canada, and I think there's a fee for re-pitching). I filled out the online request with all the info I knew, then called the next day.
By the way, if I can find a decent 2GM20 I might be interested in selling a very lightly used left-hand prop...
Ben