I have my HTPC in that same case. It is excellent with my setup, really worth getting it. My motherboard seems to support undervolting looking at the bios, I still need to get round to doing that though as I leave it on 24/7.
My setup is:
i3-3225
4gb Crucial Ballistix Sport VLP
Gigabyte GA-H61N-USB3
Crucial 64GB M4 SSD
3.5" 2tb Samsung F4
120W picopsu
Edit - The picopsu just about touches the heat pipes by the way. If need be you can get ATX extension cables to allow relocation. I also run Windows 8 for decreased power usage. I expect my idle to be around 30W with this setup.