Thanks for the input- it's definitely crossed my mind selling the Schwinn, but there's something so utilitarian about it that I want to keep it. The steel wheels are going on a Peugeot UO8 frame I picked up with extras for $5, then it's all going to CL for some project money. So, basically, the Schwinn frame will have been free.
The Tubs I'm looking at are really budget tires- we're talking $25-30 apiece. I was thinking these:
Vittoria Cross Evo XM II Tubular Tire | Competitive Cyclist
I unfortunately sold my Mt Fuji Ltd with beautiful double butted construction, and I like the feel of the road bike geometry better anyway, plus for whatever reason, I hate riding 26" wheels, and vastly prefer my 27/700s even with wide tires