We had a capri in our club and it was a fast boat however not a shoal keel it won most all races, if memories serve me correct it sold for about 5 g's canadian. hope this helps
The price will vary according to year, how equipped, and condition. Also, motor and trailer are likely to be quoted separatel by tax office or BUC (see below). 5 g's sounds low to me for that recent (2003) year model (CorvetteGuy didn't say what year model his reference boat was).
Go to BUC and see what they estimate it at. Also, contact your county tax office and see what value they put on it. Do a google search of all used boat listing agencies such as Sailboat Listings, Used Boats, etc. and see what they list them at. If you have trouble finding Capri 22's, search also for Catalina 22's....not the same boat, but similar. Since you will find the boats from a number of years, make a plot of boat price vs. year model. Then pick off where 2003 lies on the plot, and that will give a rough estimate....throw out highest and lowest numbers since they will likely not be realistic or represent at too high asking value. Visit each of the sites for the boats that you find, including photos, to see what condition they appear to be in and how equipped. Adjust your estimate of value accordingly.
I sold a 2001 Catalina MK II 22 with motor, trailer in 2010. Proper range seemed to be $13,500-$14,200 for that boat, with a new one similarily equipped being in the $22,000 - 24,000 range. Also, I believe the base MK II 22 is a couple of thousand more expensive than the Capri 22, but equipment options could vary price of either one considerably. I believe that I got $13,500 for my boat, but included a bottom paint job ($600). Boat was in top condition. Hope this helps.
p.s. Capri 22's are most often bought for racing and generally fin keel would be preferred for that purpose. However, if you sail where water tends to be shallow, then the wing keel would be the choice. Also, if you plan to trailer a lot, you would probably prefer wing keel (shoal keel) since it would be easier to launch and recover with a trailer.
p.s. 2 I went back and re-read your description of the boat. Cushions are expensive....Contact Catalina or Catalina Direct to see what a replacement set would be. Also, sounds like the boat has perhaps had a rough life and you would depreciate for that.