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I play games at 1680x1050 but I'm purchasing a 24" in the next couple of weeks so I was I was looking at the 4850 as I like the idea of Xfiring a couple of them eventually but would just buy one for now.
Play games such as Crysis, Stalker etc...
Would it be an upgrade?

It's not worth changing to as its barely better
barely better my arse....as soon as you add AA + AF the 4850 will be much, much better

I have had all the cards you mentioned except the 9800GTX, and all were voltmodded...in my experience with AA the 4850 pulls far ahead.
Even at 900core 2.3ghz shader the 8800GTS 512mb was not very good at all at anything over 4xAA 1680x1050 in CoD4.
My 4850 does well over 100-120fps average with 8xAA 16x AF int he same game and same resolution

I recall a similar conversation I had with you regarding the 3870x2 vs the 9800GTX....I said that my 3850/3870 xfire setup was faster than my voltmodded 8800GTS 512mb and you basically called me a liar and said you would wait for reviews of the 3870x2....and then when they came out you had nothign to say
) and geting another 4850 to go Xfire. 
It wouldn't be a waste of time, hes on about getting a 24 incher (ohh err) and geting another 4850 to go Xfire.
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