if u want a trendy lookin phone and are not bothered much abt camera get 5200. but if u want excellant cam, value for money and not so futuristic looking phone get k750i.
5200 is showing a few probs.Three of my frnds bought 5200 and all 3 r dead now.They hav been sent to Nokia Care for replacement.
So K750i is a better deal.