First build thoughts and tips

Hi all, after doing my research I have decided to attempt my first build.

Don't really have a strict budget however the £350 mark is good for me right now.

I'm after an all round PC for the home for general use and occasional gaming ie. sims 3.

Here's the link to my shopping basket on ebuyers http://m.ebuyer.com/?action=basket

Any hints or tweaks would be mic appreciated, just wanted to check with the experts before I purchase (uk only please)

Thanks in advance (first thread so I've probably missed something stupid out)