I had 2 extra SSD's lying around so I figured I might as well build a PC. This is used only for gaming and handles Counter-Strike: Global Offensive really well :-) .
This was my first PC build and it didn't give me too much trouble. I really like the BitFenix for its semi-compact size and excellent cable management. I ended up ditching the hard drive rack and mounted my HDD above the PSU (mounted to the front mesh panel with HDD screws) and my SSD's on the panel behind the MB. The side panels were swapped to make the cable routing more clean (the stock setup has the power button and USB cables on the panel that is removed). Cooling is a little wonky because of the inverted motherboard (intakes at the top and front, and exhaust at the bottom and rear), but helps keep dust intake down.
Peripherals: ASUS VG278HE: Awesome value, I picked this up from Amazon Warehouse Deals for $260. I use the ToastyX utility to enable LightBoost in 2D gaming. This helps a lot with ghosting in games.
Logitech G930 Wireless Headset: Picked this one up for $70 from BestBuy. Great sound and wireless is awesome
Logitech G710 Mechanical Keyboard: I picked this keyboard up for $70 from Fry's. Built like a beast, feels great for typing, and excels at gaming.
Logitech G502 Mouse: This one was purchased for $50. I previously used a G9x, but ditched it because all laser mice have acceleration that you cannot disable. This one serves me well in CS:GO
SteelSeries QcK Heavy: Love this mousepad, very comfortable and has a large surface area for low sensitivity players.
EDIT: I added the new side panel from BitFenix that features a much larger window. The old panel had a small window that didn't work well for people who swapped the panel with the power button.
You can follow my build here: http://www.reddit.com/r/buildapc/comments/2lem54/build_complete_bitfenix_prodigy_m_devils_canyon/
I chose the i5 simply because I don't have a need for more than 4 cores. I might upgrade to an i7 at a later time, but at the moment most games cannot utilize more than 4 cores. I currently have this overclocked and it runs great.
I went with the H80i because it was on sale and looks nicer IMO than air coolers. The software is a little buggy, but it has a lot of options that you can mess with.
I went with Gigabyte because of the price, great reviews, and good looks. Gigabyte has a utility that allows you to make changes to the BIOS without having to load into the BIOS, pretty trick.
I went with 2133MHz ram because it was on sale, not sure if there is a noticeable difference over slower ram. G.Skill Ripjaws X has great reviews and looks great on the motherboard.
Stay away, I've had two of these fail. My current one will randomly unmount from the system and lose the data on it.
The 280x was picked up from a reseller on eBay. Sapphire's warranty is based on the serial number so you can save some $$ by going with a used card. From the reviews I was a little concerned that the Sapphire-X might be too loud, but I haven't noticed anything crazy.
Looks great, easy to carry, easy to build, good cable management
Good reviews, semi modular, looks great.
Looks awesome and fits perfectly in the case