personally, i'd go the used route from craigslist in either a wheelset or donor bike. the last 700c set i bought like this were flawless wheels with shimano 600 hubs, for 75 bucks! it's unbeatable. but if you go the build route, get sun m13-ii rims from an ebay seller, dicker on the shipping with a well written note, and buy sapim db spokes from dan's comp at $0.40/ea.