When I started on my Private license, I beat up my club's 152 very badly. I mean, I dropped the plane onto the pavement when landing a LOT of times. I was really slow at learning the finer points of controlling an airplane.
Fifty or sixty hours of that, and I got it out of my system. Then, I went 21 years without any flying at all, except for GIB (Guy In Back) flying in the Navy. When I restarted, I immediately bought a Mooney and set out to pass a BFR. That took me a year. Sure, NOW I do just fine. I'm just saying it took me a lot of time, and I inflicted a lot of abuse on both the club's planes and my own plane.
As enticing as your own aircraft can be, it can be a cruel master, too. If you have landing problems with a new-to-you Mooney, you may become discouraged, and stop flying regularly. Even if you don't have any problems, your insurance quotes are gonna be outrageous.
I recommend you buy a used Piper, or even a 152, and pound the bejesus out of the runway pavement with that. THEN get yourself a nice little Mooney. Your emotions will push you to buy a nice Mooney first, but I believe that would be putting the cart before the horse.
Looking at airplane ads is a lot of fun. One poster on here said his wife referred to airplane magazines as "Airplane Porn". She wasn't far off the mark.
You may not believe me, but I'll say it anyway: You'll have the most fun in the simplest and slowest airplane. There - I said it. And I truly believe it.
And there are a bunch of people, who are no longer with us, who tried to push their advancement along too quickly, due to feeling that time is flying by quickly, and there's no time to waste on learning flying incrementally.
Please keep us posted on what you decide to do. We are all interested in new pilots' progress.