sounds pretty much normal. The temp gauge on these cars is a much smaller range than on most other cars, so the difference between say 1/4 and 1/2 isn't really that much. As long as it's not constantly trying to go past 3/4, and the fan is kicking on properly at 3/4 (and when AC is on) and reducing the temps, it's normal.
If it makes you feel better, you can flush & fill the system if that hasn't been done in a long time. It *might* cause it to heat up a little less quickly, but it may stay the same. Good coolant system care is always a good idea, though.
..and just because I'm thinking about it, never use "stop leak" or other similar products unless you just don't care about the car anymore and want to limp it through its last days... fix leaks the right way, by finding the leak and replacing the bad part.
