The Altima is a great beater. At 125,000 I've had no problems at all it pulls around 26 mpg (32 on the interstate), and while not a drag monster it pulls 16.6's @ 82 bone stock.
If you have the option pre 98 models have more much potential down the line if you ever change your mind on any performance mods.
For more info:
www.altimas.net