I owned an 05 CTS V (first gen actually started in 2004). The resale value will surprise you in a real bad way. Plan on around 30% the first year, dropping to about half within 3 years. Mine had a crappy rear end, interior panels came off, bad alignment from factory, a 3 year old NAV disc, etc. A mechanic told me that they can tell how many times I hit redline. Tires lasted 15k (which was good).
Ok the 09 CTS V is different. I think they fixed the rear end Performance is fantastic (straight line or cornering), interior is somewhat small (just my opinion), gas mileage is SUV like. Tires are expensive. Quality is a ? since it is brand new.
It all comes down to what you want, although I would remember that you can get a new V for almost invoice these days. SUVs do tend to hold their value better as I got $17k for my Envoy that I bought for $34k 4 years earlier. $17k for 4 years/50k is real good these days.
Good luck with the decision but don't be fooled into thinking the V is "unique or special" and demands special pricing. In the end it is still a Caddy. If I was looking at the V I would look at the new E550 Mercedes and take delivery in Germany.
