We had a 2000 base 9-3 (auto) for 3 years (54K to 97K). Driven conservatively, they absolutely eat brake pads and rotors (Front/Rear every 30K). Not so bad if you're DIYing, not good if you're going to a dealer/indy. Shocks/struts also needed to be replaced during it's tenure, bushings in the front control arms usually go and need to be replaced by poly bushings. They're very sensitive to tire mounting/balancing. I also replaced an entire exhaust from the flex pipe back at around 95K. Oh, and check for the turbo going bad (blue smoke out of the exhaust), ours cost us to the tune of $1K just after we purchased the car.
Minor stuff that seems to always go wrong includes power window rollers breaking and the power antenna becoming stuck in the up position. Both relatively quick (and cheap) fixes, but annoying. Saab aluminum wheels are very fragile, I cracked one and couldn't remember hitting any potholes.
In general, parts are not as bad as you'd think, eEuroparts will become your friend. Honestly, though, I'd stay away. Worrying about sludge and impending DIC doom is not fun. We also received gearbox selector codes, which run about $600 to fix. Broken motor/transmission mounts are also common.
Bottom line, we bought the car in 2005 for 6.5K with 54K, which was a good deal at the time (leather, moonroof, auto, heated seats, etc.). Put >$4K into the car (parts and labor), and sold the car in 2008 for $4K (with two sets of wheels/tires) with 97K. I would stay away, they seem to really drain a budget, and although the steep depreciation curve is your friend when buying, if you ever sell you'll feel the crunch. In the end, there were always a lot of things to go wrong, so we parted ways.
If you are serious about a Saab, I would only buy one with extensive service records. 10K oil changes on a semi-synthetic oil for a turbo car just wasn't a good idea. And I'd make sure the 90K service was already done, otherwise you're looking at an automatic $500 right after you buy the car.
DJ