We are here sitting out rain waiting for a break in the weather to pull our Santana 23 from the lake for the winter. We pull it with a Jeep with no problems. My guess is your Audi would do fine. The Santana is a water ballast for lighter towing, with a drop down center board for up wind sailing. It has a nice cabin (wide beam) with a pop top (we rarely felt we needed the extra head room).
My wife likes the enclosed head and we have stayed (camped) weekends with good comfort and slept in the V-birth with plenty of room for my 6' 2"s.
It sails very well and fast. With a 30' mast, boom furled main and furled head sail we readily handled 20 to 25 knot winds with puffs well above 35k and loved it. Although we always kept it on a pin in the water it is easy to trailer,
rig and sail. It comes with a mast raising system and with the shallow draft hull, with the board is up, it glides up on our trailer like a dream. Too bad your so far away, we have bought a Irwin 30 for next year on L. Michigan and plan on selling (we think) the Santana. I'm sure there are some for sale in your area. It is made by Schock in Calf. and should be in your price range.