I've had my 2003 2.5i for about 6 months now. It only had 28k miles on it. So 70k is a lot. I'm really glad I have the warranty...but also looking for it to expire. Here's why...in the last 6 months, I've replaced the radio, power top, and airbag sensor under warranty. Expect the top to go if it hasn't already (if it's a power top). I expect the brakes and clutch to go (clutch is covered under maintenance but not warranty) in the next 18 months. So first, I'd check to see when these things were replaced.
Advantages for an older, out of warranty vehicle...you're free to play!! I'm waiting for the warranty to expire before I add a supercharger as this will void the warranty on associated components (engine, tranny, clutch, etc.).
So my recomendation...get one with a year or so of warranty left, work out the bugs, then you'll at least know what you've got.