Have you guys thought about the Cal
series ? Through the 1970's they made a pretty good range of small, simple racer/cruisers. At least when you buy a Cal
you know it has been well built and probably well maintained. One of the 27, 29 or 31 should suit. For 10 - 15k or so you get a clean, functioning ready to sail boat. The boats you guys have been looking at all need a pile of work. You will find yourselves spending 10k fixing the broken stuff to make the boat 5k better. Not smart.
Take a look at these. One is even single
cal (Sail) Boats For Sale