Hmmm. The Tosa normally comes with Tetro mini-v's, or at least ours ('04) did. I just upgraded to Avid Ultimate V's with Travel Agents and I love them. No squeal from ours yet. I did also upgraded to the Burley/AQ carbon fork at the same time. Note, we went with Velocity Deep-V rims instead of the stock Sun Fusions when we bought our bike. I am a very happy camper so far.
Apparently, Speedgoat notes the Avid Ultimates squeal with ceramic coated rims...
http://www.speedgoat.com/product.asp...at=30&brand=16
FWIW...