Thanks to all for sharing comments and pictures. I have a thing for pocket guns. I am currently searching for a pristine Colt 1903 and 1908 as well as a 1908 vest pocket. Otherwise, I have lot of nice old .25s, 32's and 380's.
The XSP is a great little gun. Lightweight, yet still very soft shooting and accurate. I put some orange nail polish on the front sight to help me pick it up quicker and it is great. I carry it in my pocket regularly when clothing requires something light and small All of these guns can shoot better than I can...25 yards is well within their capability.
The government models are absolutely remarkable. Some guns just have a certain look, balance and feel in hand that renders them special...that describes them perfectly. A close second is the stainless Plus II, which is also amazing.
The Pony should be put back in production immediately!! While some dislike the trigger, I find it no different than the pull on a S&W 642. I guess too many folks do not shoot revolvers nowadays and do not have a frame of reference outside of modern striker fired autos.
All in all, while I do not necessarily look at guns as an investment, Colts of the discontinued variety will always act as a store of value with the bonus of providing pleasurable shooting as well as serving for self defense if necessary. Whenever I see one for a reasonable price, I snatch it up. May as well convert fiat paper into real assets...