The 7 is a great car, but it is also beginning to get a little on the old side. Not a major issue but just make sure all the maintenance of the vehicle is spot on. Things like timing belts, regular oil/filter changes, paint maintenance etc. are critical to a car ageing well and giving you less headaches down the road. Another good sign is to look for logbooks or recepits for all the things I have just mentioned. Alot of the time the odometer doesn't tell you the whole story. Look for wear level on the steering wheel and gearknob, cleanliness of the engine bay etc.
All the above goes for purchasing any car, but age (especially in a performance vehicle) compounds things even more. I have personally found it really hard to find a clean, close to original Evo that has been carefully maintained. When I looked for an Evo 8 MR, it took me forever to find a good one.
Once you do though, the premium price you pay for the car should save you in the long run.
BTW I think the 7's look nicer than my 8MR in many ways.