You don't NEED to get a cassette. You can get this freewheel if you can verify that your rear wheel is indeed freewheel. Remove it from the bike and take a pic of gear cluster and we should be able to tell.

You may want to call to make sure a Park FR-1 will work on these. I think it will, though.

http://www.universalcycles.com/shopp...&category=1665

Another option is just getting 7-speed brifters. I love my 1999 vintage RX-100 7-speed.

But, to answer your question, I like these budget wheels. Rims are probably skinnier than current rims though, so you'd have to adjust brakes @ every wheel swap.

http://www.velomine.com/index.php?ma...hrq33hm630ha15