Claudia, there's a 54cm Rambouillet very similar to mine that's on Ebay right now- auction ending in a few hours:
http://cgi.ebay.com/ws/eBayISAPI.dll...E:B:SS:US:1123
It "should" go for over $2000. If you miss that one you might then want to keep an Ebay search notification going for "Rambouillet". You would take either a 52cm or a 54cm Rambouillet. The 54's usually have 700 wheels, and the 52's usually have 26" wheels on them, just for your info.