I own the Canon 300D as well, with a 300mm lens and as far as I'm concerned I'm loving it. The issue of a good DSLR camera is being talked about in two other threads right now, so if I were you I'd take a peek there too. However money seems not to be an issue in these threads. Anyways, like said before the price of the 300D keeps dropping since the 350D's release. Here in Germany you can buy it for around those $750 already mentioned. However it comes with the standard 18-55mm lens which won't do you too much good for getting good shots. That will however post a financial problem there I think since a new lens, like a 200mm or 300mm one will cost you, depending on which kind you want $300 - $infinity.
I'm not too familiar with non-DSLR cameras at this time but there are a couple that don't seem too bad, like the Konica Minolta Dimage Z series, since they have good zoom. You might also want into something like that if you want to go cheaper.
Canon 40D + 24-70 f/2.8 L + 70-200 f/4 L + Speedlite 430EX