I thought I responded to this post before. Sorry for the delay!
I love seeing someone else interested in the Small Form factor builds.
If you have the funds I would still recomend going to a quad core. Of course the difference in cost between your dual core and a good quad core is fairly big, I wouldn't blame you for sticking with it.
The PSU you picked out isn't something I would recomend. I have seen people have problems with them in the past. I could stick with the standard Corsair, PC power, Cooler Master (some), and seasonic.
A couple examples of PSU's i would recomend around the same size and power
www.newegg.com/Product/Product.aspx?Item=N82E16817151093
www.newegg.com/Product/Product.aspx?Item=N82E16817256064
www.newegg.com/Product/Product.aspx?Item=N82E16817153108
www.newegg.com/Product/Product.aspx?Item=N82E16817171036
If you are looking for great reviews on power supplys check out Jonnyguru.com a friend of mine Jon runs it and does amazing work. You will also notice that newegg points out that the cooler master is recommended by them.
I would also recommend looking at noctua for cooler. Another possibility would be both cool-it's eco water cooling or corsairs H50 and H70
Anyhow, post up where you are at on the build. I would love to help you more on it!!