Thought I'd add this in here. This past weekend I put together a living room PC, mostly so I can play Steam and Dolphin games in the living room while my wife is taking care of paperwork. Specs are:
Case: Thermaltake Core V1
CPU: Pentium G3258
, currently OC'd to 4 GHz (mostly just to try it), using the stock HSF.
Motherboard: Asrock Z97E-ITX/ac
Video: EVGA Geforce 750 Ti
RAM: 8 GB DDR3-1600, Crucial low profile
PSU: Cooler Master V550
Storage: Crucial M100 256 GB, old 750GB WD Green drive for mass storage purposes.
The case is pretty much excellent. Easy to install everything, lots of space and channels to route cables around. The included front case fan is a 200 mm, 800 rpm maximum giant that produces almost no noise even when you put your head next to the box.
I like the motherboard. I haven't had anything from Asrock in the past, but it's working just fine so far. Setting up and tweaking settings in the BIOS was easy enough.
Looking at the Newegg page for that RAM, there are a lot of poor reviews. I may have made an error - I purchased the RAM because, well, I've been buying memory from Crucial since the previous century, and it's always worked, period. The pair of sticks I've got in this box are no exception, but clearly there are a lot of people having issues.
The CPU and GPU were an attempt at getting a good balance between performance, cost and heat (so I don't need to use more or louder fans). So far, that appears to be paying off - games play smoothly with all the settings turned up, but the temperatures stay reasonable and the noise level barely increases, if at all. I'm plugging it into an older 720p television, though, so nothing I'm playing is turning out to be terribly demanding.
I've got Windows 7 on the box right now. I'd actually like to be running Linux with Steam instead, but I also want to be able to watch Netflix, and that looks to still be a few months down the road while Google gets their HTML5 support finalized. Transition can come later.