Congrats, Tom. I have a 2000 CAAD3 which I don't mention cuz I'd assumed I'd get flamed for the modernity. I cannot remember the timeline but C'dale made CAAD4 that same year then evolved thru CAAD7 to 10, and whatever they're doing now, over the years. There is a wealth of C'dale catalogs out in the cloud that should help you zero in on the model year.

I like mine. 21lbs road ready with Vetta TT saddle, heavy Vittoria tires, cyclometer, etc. (My Raleigh Pro Mk IV weighed in less on the old bathroom scale). My frame says R600 with lottsa 105 bits and bobs and an Ultrega crankset and HS. Mine still has a threaded tube and a proper quill stem (as gawd intended it) so it's sorta C&V. None of those threadless plumbers fittings. On the road the ride is a bit stiffer than a good steel frame but that stiffness makes it accelerate very nicely and climb like a monkey. And the 105 indexed shifting can really spoil a guy. Flick, flick, gone.

I really like it and have done thousands of miles on it, couple of metric centuries, bit of trail work. BUT it looks like something Gene Roddenberry designed - like you'd see on NCC-1701-D. I do like proper lugged frames with the craftmanship 'worn out on the sleeve' as they say.