Ok, looking at this a little closer, a FLHTK will set you back $25K++. A used '09 SEUC is going to run you in the neighborhood of $31K+. So there is a substantial difference in price. With that said, I may have second thoughts and go brand new and get the Limited.
BUT...Since he already has 2 CVO's now, I would have to assume that if he gets the Limited, he's not going to be happy until he adds some dressing to the floorboards, chrome controls, chrome lowers, and who knows what else. By the time he dresses it up to his standards, the difference between $25K and $31K narrows significantly. I agree with the person that mentioned the idea of getting rid of both the other CVO's, and going with the SEUC, 09 or 10. I personally don't see the need for another bike, as the SEUC is great on the highway, and it's manueverable enough for bar hopping as well. If he wants some versatility, he can make the tourpack removable and change out the seat for the Street Glide look. Getting rid of both the CVO's will take the strain off financially to do whatever he wants to the SEUC. If I was going to get a 2nd bike, it would have to be a nice dirt bike.
With all of that said, the Limited is a pretty nice bike and should fill the need well, if that's what he opts for.