Thank you everyone for the information!
As a general reply to mostly everyone's comments, My budget is about 50 to 55K. We will be paying cash, so I'd rather not try to stretch another 10 or 15k to buy a J. Honestly, an F will be a HUGE improvement over every single airplane I have ever flown over the past 12 years of being a PPL. That to me is enough.
My main requirements so far are: about 1000 hours on the engine or less, IFR GPS, AP, decent paint and interior, recently sealed tanks, and if I am not already too picky, I would prefer an older plane with manual gear. I am having difficulty finding all of these in a single plane, and based on my own reading and several posts here, it would be better to find a plane with all of the equipment and avionics in it I want rather than pay to have them installed myself.
Just today, I actually found one right down the road from me here in GA: http://www.trade-a-plane.com/detail/Single+Engine+Piston/1976/Mooney/M20F/1286297.html
My only thought though is that the engine has more time on it than I would like. Any input on buying a plane with 1600 hours on the engine? Other than that it looks excellent! Especially considering it is the only mooney I could go visit in person in a 40 minute drive.
A few more things I would appreciate some input about: How long is a tank reseal good for, why would someone just reseal the left tank over both (as in this plane's case)? How much below the asking price would a decent offer be, 3 to 4k?