Whatever you do choose, DONT get the nokia.
My son has an N73 - I have an N80, and I have colleages with both.. we are all very, very fed up with them! I cant wait to get shot of mine, its the sloooooooowest phone Ive used in years, all the others agree... and consistent across all of them seems to be that they tage FOREVER to reacquire a signal once lost.. Ive travelled the same route every day for years, with different model phones, I know exactly where I lose signal and where I regain it.. nope, not with these new N series, they take literally a mile or two further.. hopeless..
Also, theyve gone backwards with some of the features: You have to set the alarm every day, they don't auto-repeat.. you cant see the properties of a text (like time sent) without going back to the list menu.. If you have several missed calls from the same number, you only get to see the most recent time rather than the previous ones too.. my old 6230i was a much better phone, and I am thinking of going back to that and chucking the N80 up on ebay.. My son feels much the same about his N73..
Video quality is good, still pic quality is V poor against the sony.. The N73 is AF where the N80 isnt, but neither compare.. oh and the stupid stupid stupidly thin power connector for the charger (MUCH thinner than the traditional Nokia one) you only have to accidentally 'nudge' it, let alone drop it, and it cracks.. I have a replacement on order, a colleague has replaced theirs twice!
www.gsmarena.com is good for really detailed reviews, but I for one would be very very happy to swap my 3 month old nokia for a sony instead. I dont expect perfection, but having been a nokia fan for years, I think these are a real backward step..
Course, if you want to buy mine, its great! ;-)