Yeah the full size SUV market is limited unfortunately. At the time i was looking I couldn't find a Suburban or Tahoe in my price range that was in decent shape. My brother has a 2000 f150 that has been good to him so I decided to take a chance. So far for me It has been a mixed bag so to speak. I do like the truck and set up, but have had a few pretty major issues with it after purchasing. It started about a moth after I bought it with a stumble / hesitation that turned out to be coil pack # 3. I had sent it into a ford dealer for diagnostic and to have the plugs changed. When they pulled one of the plugs on the passenger side they found that someone had installed a Helicoil and cross threaded it into the head. That cost me about 1400 to have a head replaced. about a week after I got it out of the Shop the Transmission lost reverse and wouldn't shift out of 2nd. The truck sat for about 5 months. Now I have a used transmission in it and It seems to be running pretty good. So for now I am going to be watching the truck for the next month or so to see if I want to build this up or trade it in. Still on the fence as of right now.
It sounds like you took care of the biggest neglects/screw ups already.
If you keep it, get a 40k gvwr trans cooler. It'll help with the biggest weakpoint in that transmission: heat.
Something else to look for:
1) if you have windshield leaks, make sure tp fix it soon. The water can get into the cabin and if it does, it can make its way to the fuse box located on the driver's side. If the fuse box corrodes, it can affect the GEM module that controls the Auto4wd.
2) change the transfercase fluid. It'll help the clutch in the Torque on Demand BW4406.
3) if you want to disable the Auto4wd at will to have 2wd as an option, look up the Brown Wire Mod.
4) if you have issues with the a/c blowing air through the defrost vents under load, look at the vacuum hoses in the engine compartment first. The vacuum canister is against the passenger side quarter panel, next to the battery. I just replaced the dried and cracked hoses last week. Not surprised on a 17 year old vehicle.
Other than that, expect to have the usual maintenence to be expected with an almost 20 year old truck. Mine has been pretty trouble free so far with the usual preventative maintenance.