btw..i have the k850 and the k750(WITH MODDED DRIVERS)..and i daresay it sounds better than the N91...if u know how to mod SE
K850 sounds better than n91 !! dont know , but please dont say that k750 sounds better.
And regarding w890 its a good phone at least all its specifications say , but have you ever used it in personal. I only comment on phones which either is used by me or some of my relative .
I have been using n91 for some time now and that is why i mentioned it . You can read its review which is written by me here
*www.thinkdigit.com/forum/showthread.php?t=82228
Conclution : you can continue your contract with Sony but for gods sake please dont post any wrong or crap imformation regarding any other brand .