>>1626261>>1626263>>1626259Those are pretty different.
>fully serviced and ready to ridethis can mean a lot of things. The bearings might be rough. The drivetrain might be stretched. The STIs might be pretty gummy. I'm sure you -can- ride it, but it might still warrant work. The bartape job for one is awful and the colour is awful on that frame.
It's a nice bike. Everything will be highly compatible with common modern parts which is nice. The thing about cannondale road bikes of that era is that the ride on them is famously quite stiff and harsh. So if you want it to go out on short hammer rides in a city, fantastic, but if you want to get more seriously into road riding and do centuries and stuff, I would personally prefer to buy a classic steel bike, even if that meant downtube shifters.
I would suggest you take the cash to go test ride it, see how you like it. Visually inspect the chainrings for wear. Cassette & chain wear is fine, you can cheaply replace those. Lift the chain off the crank and spin the bottom bracket. See if it's rough. See if the head bearing has play and is smooth. See if the wheels are true, spin smoothly with no play, and have no loose spokes. See how bad the hoods rubber feels. And maybe haggle based on these things.
Price at the moment is really dependent on market. It is a good bike.
The only thing to pass on it over would be serious frame damage. Very thoroughly inspect for cracks. Dents or paint chips are fine.