06-09-07: Ledhed2222
All of your info is helpful; I appreciate it! What do you think of Grado cartridges? My preamp has an MM input (but not MC) so I was leaning towards Grado.
The Grado Prestige line isn't a bad place to start, but there are other viable alternatives in the same price range, including the Ortofon OM 5 or OM 10 (depending on the sale price), the Shure M97xE (I paid $99 for mine but some on this forum have seen them as low as $50), and Audio Technica AT95E at under $50 or AT440MLa at about $85 if you get a lucky score on your turntable.
When you start putting the rest of your system together some of the people here may be able to help you pick the cartridge that best complements your downstream gear.
Sometimes you can get lucky. I got a Yamaha belt-drive semi-automatic turntable at a garage sale in Feb. for $2. It uses a P-mount cartridge. I replaced the cartridge with an Ortofon OMP 10, added an anti-static mat, and set the turntable's feet on Vibrapods and got a very musically satisfying player in return. Certainly not the highest resolution, but the P-mount arm virtually guarantees your cartridge is tracking at 1.25 grams, which should go easy on your records until you can afford something better.
About 3 weeks later I did buy a Technics SL1210 M5G, and enjoy the difference very much, but really, I could have gotten by on that old Yamaha pretty well if I'd chosen to.