personally I'm not into power, inefficiency, big cars, really the mustang does zero i'd want in a car over any other car, but i'd still own it if only to sell it and get some cheaper garbage that i'd hate as much but spend less on. haha.
I actually got my 97 Stang for cheap, and for the most part it gave me 50K hassle free miles minus normal items like tune ups. I sold it and bought a truck or else i would have just kept driving it. It actually did decent on the highway too. Im not a Mustang buff by any means but generally speaking they are reliable cars. Im much like you in the regards that i could care less about power, luxury, or large car. I realized driving that mustang that a car is a car, and regardless of what Im driving i normally just want to get home and get own with my other hobbies. Thats why i drive beaters now... I can get a dent on the car and not care, and I just do what they need to keep them going. Not need to waste a saturday afternoon polishing it up. The basic requires for me now beyond initial selling price is...
1) Has A/C
2) Gets good gas mileage.
3) Prefer a manual (not a deal breaker)
4) Prefer a hatch or wagon (not a deal breaker)
5) Minimal overly rusty - it needs to be solid enough to justify putting money into it.
6) Power windows & cruise are nice but not deal breakers. Neither my truck nor car has power windows currently.