Which phone do I buy?

[max]

Hey guys!

I'm new around here and pretty much to the world of Sony Ericsson. :) Had a Z600 aeons ago and then it was all Nokia after that. I came across a friend's SE and whoa! SE has changed and how! Anyways, I'd like some help to decide which model I should go for. I'd like the phone to have the following features:

1. A reeeallly good camera.
2. A flash (xenon or LED, either would do fine).
3. It should support flash menus and flash themes, basically a darn good, snazzy interface.
4. Preferrably not too bulky and black/blue in colour.

I don't ask for much, do I? :P

I have the foloowing models in mind:
K810i
W610i
K770i
K550i
W810i
K8501

Which one is the best? Is there any other model you guy would suggest? Pls help me out with this decision! Thanks a bunch! :D

Cheers!