[Off-topic] sub69:
I just got myself a K800i from eBay to go with my array of Windows Mobile phones. One of the first thing I did was flash the K810i firmware to it (although that did nothing to help with the big lump on the back of the phone, which the K810i will not suffer from!)

I was just after a cheap phone with the best camera available, purely to use on a stag-do I'm going on soon. As my limit was £100 (in case I lose/break the thing) my choice was between the Sony and the Nokia too.

I went for the Sony, largely because it has a *proper* flash which will come in handy in low-lit bars and clubs, but I also have an irrational dislike of Nokia's, and I've owned Symbian S60 devices in the past which, looking back, I wasn't thrilled with (Although I loved my old Siemens SX1 at the time).

A good friend of mine has an N73, and in the interest of balance, I will say (grudgingly) that having had a play around with it, it's one of the nicest Nokia's I've seen for a long time. Very good quality pictures, and the latest S60 is better than it ever has been. Only the N95 is better, but that costs a fortune at the moment!

Having used my K800i for just over a week (to get used to it before my drunken trip) I'm seriously considering keeping it as my main phone, at least for the forseeable future. The camera is truly brilliant, even in the absolute pitch black, it has an RSS reader which I use heavily, a capable media player and FM radio, a QVGA web-browser which is at least as good as Mobile IE on a Windows Smartphone, and a massive range of QVGA Java games available. The main thing though, is how insanely usable I'm finding it. Even the N73 doesn't beat the K800i for ease of use.

I have never used video recording on a mobile for anything except MMS, so although Qcif is a bit off-putting at first, it really makes no difference to me. If you're going to be using it for viewing on your PC, then I would say that the general video quality on the K800i comes out about as well as my Universal or my Hermes, despite the lower resolution, mainly because the framerate is more consistent, and the colours/image is sharper to begin with. The N73 is obviously superior for video though.

The main limitation of the K800i for me, is the rather basic e-mail. On my main e-mail account, "push" IMAP4 actually delivers my e-mails to my K800i before "push" Exchange does to my WM5 device (which I'm baffled by). However, you can't view .doc .xls .ppt .pdf attachments on the Sony. You can download and forward them on, but you can't open them.

Also, my music collection is in .ogg format, which the Sony can't handle. It's a shame, because I'm now having to rip things to mp3 for the plane trip.

So basically, if you need flexibility then the N73 is the one to go for. It has better video, and a better e-mail client, plus you can add on extra software features as you go along 'cause it's a Symbian phone.

Have a play around with a K800i - the K810i really is virtually identical, so you'll get a very good idea for yourself of what it will and wont be able to do, but I'd say if you want a more stylish, and extremely usable phone for daily use - with a slightly better camera - then you should go for the Sony.