IMO, by the time you pay shipping buy purchasing part by part, you can get a whole bike with 105 or ultegra, and a nice one at that on ebay for 1000-1200. I would recommend buying a whole used bike and then replacing a component or two that you dont like, if you feel inclined. Buying a whole bike, whether new at the shop or used on ebay, will almost always be cheaper than going one piece at a time. Just my opinion. I have built several ebay bikes and have found this to be the case.