I wouldn't touch it with a 100ft pole. That 'regular' maintenance doesn't cover the high probability that a crank sensor, head gasket, fuel injection, or any other number of moderate to severe failures will occur. ~200k miles is usually around the upper range before serious problems start to happen on almost all cars.
If you're working on a tight budget, find something nice and well-maintained, that has a WHOLE lot less miles on it. It might not be as 'nice' of a car, but you'll actually get more from your money.
Think of it this way, you find another well-maintained car that is selling for $4500, that has 90k miles on it. The odds of getting another 110k miles with good maintenance habits are pretty high, depending on the brand/motor/tranny, and so on.
The odds of getting another 110k miles out of that Saturn without running into a major repair (engine failure, transmission failure, fuel injection system failure, whatever) are pretty slim.
Here are a few examples of better typical choices for that amount of $$ (or less)
'01 Accord, 139k miles
http://dallas.craigslist.org/ndf/cto/963058996.html
'01 Altima, 114k miles
http://dallas.craigslist.org/mdf/ctd/963042157.html
'99 Integra, 130k miles
http://dallas.craigslist.org/ftw/cto/962904551.html
'04 Focus, 122k miles
http://dallas.craigslist.org/dal/ctd/962819970.html
'96 Corolla, 122k miles
http://dallas.craigslist.org/mdf/ctd/962801703.html
'02 Saturn LS, 108k miles
http://dallas.craigslist.org/dal/ctd/962534287.html
'96 Infiniti J30, 119k miles
http://dallas.craigslist.org/dal/ctd/960090215.html
etc, etc.
Just because a car has low miles doesn't mean it's a good deal or hasn't been abused, but you have to shop around. If a car has 150k+, it's generally a better idea to look elsewhere if you plan to keep the thing for very long without doing a bunch of work to it. 180k+, that gets pretty scary. Even with great maintenance habits, a lot of things on that vehicle have gone through a lot of stress.