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Unless you are getting them for about 70 quid each then i would say its a pretty bad move. Out of all the cards in the 5*** the 5830 was probably the worst as it was just a little faster than the 5770 but was as big as a 5870 and was almost as power hungry. Also, for xfire, the 6*** are much better.
All this is just down to what i have read on the graphics card forum since the release of the 5830 as i was interested in buying one a while ago but decided against it as the reviews were pretty bad.
Plus, did you not see Gibbo's thread about price reductions at the end of the week on most graphics cards.
the 5830's are great overclockers, if you get a pair of them running at 850 or more then you'll be pleased with the results