I would double the RAM, not sure about a wireless card on a desktop, I prefer a wired connection. Apart from that you have quite a nice build going on.
Buying from Scan is a good idea as they are a company I buy most of my components with and any problems are soon sorted by their customer service dept.
Remember that should you have any problems with your build, and that is likely, I still have problems and I have been building a while now. Do not be afraid to ask questions if you need help.