I have the very first Cervelo P3 ever sold into the US. It’s a 51 cm with 650c wheels. I have both a set of Hed Jet 6 wheels and a set of Zipp Firecrest 404 650c wheels for it. It has a set of Felt Devox aluminum aerobars and a 172.5 DuraAce 7800 crankset with gorgeous new FibreLyte carbon chainrings. The frame is 15 years old. It’s never been crashed, but it was ridden and raced, so it has a few scars and old Cervelos were notorious for their rotten paint jobs … though this one was kind of a carbon black color to start with, so it isn’t so bad. I raced it a few times last year and it’s quick as it is. But a bit of sprucing up could help it some.
I’d do $750 plus shipping for the frame only. For $1,000 I’d include the Felt aerobars and a Cobb V-flow Max saddle. For $1,100 I’d include the crankset with the FibreLyte chainrings. For $1,600 I’d add in the HED wheels. For $2,000 I’d add in the Zipp wheels and for $2,500 I’d do both the HED and Zipp wheels. You’d need to add the shifters, brakes and derailleurs, plus chain, cassette and tires/tubes.