Trek 620
Just snagged this Trek 620 off Craigslist for $240 talked down from $300. It's the 64cm size, either 84 or 85. Almost all original save the Tektro brake calipers. Did I do good or overpay? Also, I'm thinking of ridding the Huret Sachs in favor of a Tiagra derailleur, 8 speed cassete and throwing on some 700c wheels. Will this depreciate its value?