I will say that I just saw a tiagra triple crankset (I think the seller said it had ~500 miles on it) go for $25 on ebay. Almost picked it up myself, but I decided that it wasn't enough of an improvement over the RSX crank that I'm going to put on there to be worth having to hunt down a new bb spindle. Deals are out there if you really want to make the move.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"