Cinelli is a very desirable marque. However, before anything, I would carefully check the downtube just in front of the shifters for damage. Whenever I see non-matching wheels, I presume the bike might have been involved in a wreck or run into a curb. This often is the reason why front wheels get replaced, as they are bent past the point of repair. I also see some paint damage in that same area, so look for a deformation or wrinkle in the tubing.

If that is a negative, the bike should bring anywhere from $800 to $1,000 or so. You can also search ebay for completed auctions on comparable frames. Lots of threads about Cinellis on this forum as well.