In 1997 my associate and I bought a 93 with 64.000 on it, now about 170K. Sure its needed maintenance, the V-clutch needed replacement when we got it, trans needed a re-do at 125k, the suspension was done at about 100k. Engine needed stem seals at 115k, and the lower intake resealed at about 165k. Heads have never been off. Injectors, turbo, radiator, upper and lower IC all original. The biggest change from stock is I added 2nd Gen front and rear disc brakes and eliminated the ABS about 4 years ago. Huge improvement in braking, and the 93 ABS will have you to wrecking your Ty if you drive it hard enough for long enough. I had two close calls, and pulled the plug (literally) on the ABS until I did the conversion and took it out of the truck entirely.
It's been across country and back 3 times without opening the hood. It's my little game with it. I look under it for leaks at every stop, but don't open the hood for anything else. I check the oil before I leave, and on the other side before the return trip. 23 years and 100,000+ miles of virtually trouble-free enjoyment. I'm accustomed to the unlimited traction of AWD. I get in my Corvettes (especially the 90 ZR-1) and get in trouble with wheel-spin. The Ty just goes. My day is made if I can be first car at a red light. My game is to be across the intersection before the car behind me gets to the intersection.
My secret? Ask anybody here that's been around long enough that knows me. I advocate bone-stock, change nothing, leave it the fuck alone. I have had stock PROMS and calibrations in all (7) of my SyTy. Don't even work on it if you don't have to. Leave the hood closed. Drive it stock, and it will be reliable. I drive the crap out of my SyTy's and they run damn well and don't break. The secret is stock engine calibrations, keeping up with the leaks and fussy maintenance (I just put the third heater core in my Ty), and be careful with the cladding. Don't bump into shit with it, be careful where you park it so it doesn't get backed into, all to keep the cladding from being damaged. Replacement cladding is now a real issue.
Find and purchase a nice un-dorked with Ty, if it has a "chip" take it out, fix the leaks, and generally leave it stock. You won't "run 12's all day long" (nobody that has a 12 second street Ty does for long, it blows the fuck up), but you'll have an enjoyable ownership experience with a 14-second street Ty, (which is still a formidable performer). I have.
EDIT/ADD: You mentioned a Sy. I wrote about Tys. Sys are a little quicker, and IMO more prone to theft. I'll park my Ty anywhere, even overnight in a motel parking lot. I wouldn't think of doing that with a Sy. Especially a nice one. It'll get stolen and VIN-swapped, or shipped overseas. Sys are almost too desirable to leave unattended any more. Owning a high-theft vehicle and having to worry about "keeping it" detracts from a positive ownership experience.