I really like Pentax's entry-level offering - every current Pentax DSLR has in-body shake reduction and a weather-sealed housing. Their kit lens, while still a kit lens, is more highly-regarded than anything from Nikon or Canon. The Pentax lens mount (K-mount) is compatible with millions of lenses made in the last 25 years, giving you an excellent used lens market to shop from.
Ergo, I'd check out the K200D
. I have one and it's really great, although I haven't had the time to use it that much in school.