thanks everyone for your responses.
morty: thanks for your input. i'll see if the 15" wheels clear the calipers. if not, i guess i have some snows to sell.
brianmw: so far, we like the legacy a lot. there's a lot of room inside & the interior redesign is a huge improvement over earlier models. although it doesn't handle like a bmw (the suby replaced a 328is), it does handle very well. it's a very comfortable ride, with great visibility & tons of room in the back.
the other model we were seriously considering was a mazda6 wagon. although lots of people really like the 6, we thought the legacy handles better & has better visibility, we expect it to be more reliable, and it has the added bonus of awd. that said, there are some very good deals to be had on the 2004 mazda6 right now.