If you don't know what to look for... take a friend, or do a search on this forum or sr20de.net. Also, and I can't stress this enough... be prepared to walk away.
But, with that kind of mileage, and if the car runs/handles well... go for it. Basically, what a car is worth is what you're willing to pay for it .vs. what someone else will pay for it. SE-R Classics are hard to come by. Toolapcfan knows what I'm talking about. Hell, I flew from FL. to NC. to look/purchase mine. I'd a been in a shit pot of mess if mine had been a P.O.S.(had no return ticket purchased for a flight home... hello Greyhound!).
Keep in mind, all our cars, since they are older, or going to need some fixing up. Depends on how much money you want to spend on a car and how much it will cost to fix.
Lots of people here have gone through the same thing you are, and it is a nice club to belong to.
Later,
Mark