If you think a Mooney is expensive, look at Beechcraft parts. That will change your perspective.
I've owned a 66E for 11 years that has had crappy paint and interior since I bought it, but a solid airframe, a good engine, fresh tanks from Wet Wingologists and a working Brittain AP. My first two annuals were eye openers at $3k and $5k. Both were owner assist but I had some deferred/overlooked items that needed to be addressed. Once a knowledgeable Mooney IA goes through the plane you can get it up to snuff and then just need to keep it that way. I'll be the dissenting opinion and suggest that you can find a solid airplane in the $30s in this economy. It will take a lot of shopping and looking at planes that end up being a disappointment. They won't have modern avionics. But my plane, with dual VORs and a handheld GPS gets me where I need to go. Living in the NW, my utility is limited more by lack of deicing that it is by its avionics suite. 10,000 ft+ MEAs do that to you.
I now work with an IA that does annuals in my hanger. I do all the work under his supervision and I trust his thorough inspections and second set of eyes. But they still cost $800-$1,000 depending on what I need to address. These planes are simply more work than a less complex, fixed gear single. It takes me about 6 hours to get it opened for annual and about 10 hours to put it back together following annual. Mooneys can be a pain to work on due to the tight engine install.
Parts are not expensive, as far as airplanes go. The cost if the intake connector boot will piss you off since it doesn't seem to last that long. If I need a Mooney part, either my IA or LASAR can often provide used. The rate at which these planes are getting scrapped/parted is making used airframe stuff more attractive.
One thing I didn't see mentioned is your mission. Mooneys are the most efficient cross country traveling airplanes for a pilot or pilot +1. If you have places to go and pay your own bills, all the data points to a 4 cylinder Mooney. No other comparable plane can be operated for the same costs. Look at old Bonanzas, Commanches and Arrows. The Bo and Commanche 250/260 can meet the speed at 30% more fuel burn and 6 cylinders to care for and higher maint costs. The Arrow is slower on the same fuel.
But, if you just fly for fun around home and maybe will take a vacation trip now and then, there are cheaper things to fly than any complex single.