I do not like the case but that is a personal view but you seem to be spending a fair bit of your build and then sticking it in a cheap case.
I have never heard of that brand of PSU but it may be that it is not sold or very popular here in the UK.
It is unlikely that you will ever come close to needing any more than 8Gb of RAM unless you were going to be running several virtual machines or you do hard-core video encoding or audio engineering.
Unless you really want Windows 8 I would stick with windows 7 as there is likely to be big changes this year sometime from Microsoft and Windows 8.
Apart from the above nice build.