Tricky. The 350D is a fine camera. I have one, it's my main camera. All of the pictures on
http://www.stagepics.co.uk were taken with it. But you have a couple of things to think about:
1) The camera could easily be three or more years old now. That's probably like buying a ten year old car. You might get a beauty... or you might get a total lemon. I'd be very nervous about buying one without having a good chance to play with it first.
2) As ukcatfan said, you will very soon find that buying an SLR is not a one-off purchase, but is an invitation to buy lots more stuff - especially lenses.
I've easily spent twice the cost of my camera on lenses.
So have I, and I only have three lenses!!! It's the ability to use different lenses that makes the camera flexible.
Before you leap, I would advise you to check out the cost of the Canon EOS1000 for comparison - at least it would be new and covered by warranty, and from memory its specs seemed very similar to the 350D
regards,
/alan