See, i am K750i user. no matter how you praise the camera. its worthless indoors. pics are too grainy indoors.
Overall its good phone. very good. but it has its drawbacks. The reception is clearly not as good as Nokia phones.
Saw K790 and honestly you better spend 2.5-3k more and get N73, be it grey market. The N73 camera is without doubt best i have seen when it comes to picture quality.
My sis owns N72 and its decent. Keep in mind most of the times using camera outdoors the autofocus is not an issue 9 out of 10 times.
Outdoor cam quality of both SE and Nokia is good. Indoors, low light SE sucks, Nokia sucks too but it tends to be little less grainy.
Symbian is always added bonus. i miss that after i moved to K750i from 6600.
For 15k i would say get N72.
10-11k range = K750i
20k range =N73.
Thats my preference. No point getting W800 honestly.