I like the Canons also, particularly the ones with Image Stabilization (IS).

One good thing about getting a camera that uses AAs is you can always find regular batteries for it should your rechargables run down (or even fail completely) before getting to a camp with electricity. I like the Energizer NiMH rechargables found at Wal Mart. 4 NiMH AAs with charger is nearly half the price of one proprietary Lithium battery that the other camera models use.

Check this link at B&H for a Canon IS in your price range. B&H is the best place to shop online too, btw.

Edit: Oh, and you will need at least a 1GB memory card or two if you want any sort of capacity. High megapixel cameras use lots of space in the highest quality settings, though that can be dialed back if you prefer capacity over outright quality.