I own a 5800 and it is a nice card. Makes no noise (has the small fan, not the Ultra fan) and outperforms every thing below 9800 and 5900 cards. I would only recommend it if it was part of an obsolete stock clearance sale and significantly cheaper than a 9800pro or 5900. Paying more than about US$150 right now would be crazy.
Comparison of 80 graphics cards: http://www.ixbt-labs.com/articles2/over2003/index.html