Mike,
Have a look at www.tophatyachts.com Facebook site Top hat Yachts
and my blog at sailblogs.com/member/seakaYour budget of 10K will get you a good Top Hat. The secrete is getting one with most of the expensive gear already onboard.
Don't be to fussed to much with electronics as probably better to replace all with state of the art. So things like roller furling and near new sails, new outboard motor [but from what you are wanting to do you should have an inboard diesel about 10hp. ]
Mark 1's have more water onboard and are solid fiberglass whereas Mk 2 & 3 have foam or ply core to the decks. [check for softness, especially the forward deck] All marks have the same hull, so no advantages there. The major difference between the marks is that Mk2&3 have lower cabin roofs [each a bit lower] than the Mk 1. Once you get onboard you will see the difference in the cabin floor and how much you have to duck to get into the cabin.
Feel free to PM me for a phone number if you wish to talk.
You are halfway there Mike when you said the "TH25 is the boat for me".