If you are talking about the original XT, the 350D, I wouldn't get. The oldest I'd get is the 400D, the XTi. Bigger screen, and much better auto-focus system.
With price drops on the XSi, you may want to save up a little longer and get that one. It has the DIGIC III, and live-view which is nice to have.
Also, between each one, the ISO (for low light shooting) was much improved.
http://www.dpreview.com/reviews/comp...s450d&show=all