Like BigDog said for $300/400 you aren't going to find digicams that are expandable. Aside the the macro and wide-angle lens and adapters, you're going to be limited to swapping on some filters. You can however get a really nice point and shoot for that much. I wouldn't recommend the Casio or Minolta digitals. They have issues with longevity so unless you're okay with buying another cam in about a year I'd pass on them. I'd also caution against the Nikon digitals as their picture quality isn't entirely consistant.
For what you're looking to spend though you can take your pick from a wide assortment of Sony or Canon PowerShot cams. 4MP Canon (will accept their alternate lenses) [
http://www.steves-digicams.com/2003_reviews/a80.html]. There are also some Olympus digitals in that price range that have gotten some good reviews but I don't have any first hand experience with 'em.
Hey BigDog, I just got one of the Sony F828's and it's killer! Glad I held back on the 717 and waited for this one.
