That's probably 7 speed cassette, huh? You'll need to switch out the hub for one compatible for 8-9-10. Shimano Deore can be had for a little over $30. You'll no doubt need new spokes. And, a twenty year old MB rim? May or may not worth it or even be reusable. If you're near the city (PDX) drop by Performance Bikes. I see some good deals on complete wheels there from time to time, even though they aren't on my "favorites" list. Check your LBS too, or even Craigslist for a good used wheel.