I built this computer to be used mostly as a DVR so it is basically a media PC. I agree on getting more than 4GB of RAM. You'll see a much greater improvement in performance with 6 or 8GB of RAM and a regular HDD than 4GB of RAM and an SSD.
I actually installed a 32GB SSD in this computer a few months ago. I have Windows installed on and most of my software. I have it setup to send my recordings to the 1TB regular HDD which I originally put in there. I like having two HDD in it because I can put all kinds of stuff on it and not really worry about running out of space. The programs that will benefit from the SSD the most I have installed on it and the others I just install on the 1TB. I like the SSD because the computer runs much smoother, quicker, quieter (my Western Digital 1TB is VERY noisy) and SSD's will run a bit cooler too. I don't think they're worth what they're selling for now though.
I personally don't feel comfortable with anything less than a 500W power supply for a media PC. I have a Thermaltake 500W power supply in mine and I've been very happy with it. The price ($59.99) isn't too bad either. Here's a link to it on Newegg: http://www.newegg.com/Product/Product.a ... 6817153113
Good choice going with the quad core processor. The processor in mine is a quad core and I love it.
I've also been happy with my Gigabyte board. It has some fairly nice software that comes with it that makes overclocking nice and easy.
Overall though yours should be a pretty good PC. Remember that you can always upgrade later on.