Go big or go home, get the M20L.
The Porsche engines are no more, due to Porsche backing out. Some were replaced, many were destroyed by a hurricane while waiting in shop time for the engine swap. It was the first long body Mooney.
Other long body Mooneys still available (the U & V are in production, others are not):
M20M = Bravo, turbocharged but thirsty.
M20R = Ovation, NA but capable. Can be upgraded 280 to 310 hp.
M20S = Eagle. NA, also can be upgraded 240 to 310 hp.
M20TN = Acclaim. Turbo, capable, fast.
M20U = Ovation Ultra, new interior, 2 doors. The ultimate NA Mooney.
M20V = Acclaim Ultra. The ultimate 2-door turbo Mooney.
Happy shopping! It's fun spending other people's money . . . .
But there's nothing wrong with a K, either. They aren't common, but look for an M20K Encore. They've been prettied up, beefed up and have increased useful loads.
I'm happy with my little M20C. I also don't need a turbo, the eastern mountains are easily topped even by my humble 180 hp model.