The bargin of cervelo range has got be the S1 they have been making it for years , it used to be the soloist team.Its probably one of the very best aluminium frames being made today. With decent groupset it will build to a very light, stiff bike which I regularly see at races. If you have plenty of cash and you want a more relaxed ride, aimed at sportive type rider, go for R3.Cervelo make incredibly good frames, which are very highly thought of, they are up there with the best; colnago, pinarello, look,time etc.