media centre pc ( in england )?

Wanting to build a media centre that has at least or roughly the following :

Intel core 2 duo ( dual core 2ghz plus )

1gb RAM possibly 2gb

500gb hdd

1 gig network card

blu ray / dvd rw optical drive

An Nvidia graphics card that has

s video out

dvi

vga

An inbuilt infra red sensor with a remote and also a wireless keyboard and mouse ( in case the remote dont work )

Not sure what OS I require was thinking windows xp MCE or windows xp pro

Need the network card to work as will be streaming and or putting some movies onto the hard drive.

Want it to be slim line , something similiar to :

http://www.mediapc.tv/index1.html

making sure to select the following link thats on the left side ( about 3rd down ) --> mediaPC.tv Slim HD

so that the media player is slim line as possible.

If not then it has to be silver.

Dont want to spend too much more then 400 £ ( uk pounds. )