EDIT: Thanks everyone for all the comments! I wasn't expecting so much positive feedback - you guys are awesome!
This is my first build since 2009 and also represents a transition from a laptop back to a desktop. I simply got fed up with my laptop's overheating issues and poor peripherals that I decided it was finally time to move on. My old desktop was a bit unwieldy and noisy, so my target was a build that's more compact-looking and silent while not sacrificing performance. After weeks of research and catching up with the times, this was the result.
The Corsair Air 240 perfectly suits my needs for an ergonomic and aesthetically pleasing case. It produces plenty of airflow and was very easy to work with. It's clean-looking and small enough to rest on top of my desk side ledge. The only downside was that most air coolers were too large to fit, so I had to use a liquid cooler. I wanted a Skylake CPU since it just came out, but there was just the one mATX LGA1151 motherboard available at the time so I didn't have a choice. So far, it hasn't had any issues.
For me, the main focus of this build was not solely performance, but overall user experience. I wanted a modern multimedia entertainment package. For this reason, I spent a little more cash on peripherals. I was able to get the speakers and headphones in a combo deal from Adorama, and they are simply stated, amazing. I've had surround sound Logitech speakers in the past, but if my memory serves me right, these new studio monitors produce much crisper and more accurate sound. I generally don't like using headphones as they tend to physically strain my ears, but these are comfortable enough to wear for several hours straight. I've never used a mechanical keyboard before, so it took some time to get used to, but the response and feedback from the K70 is fantastic. And of course, my trusty Naga Hex is perfect for playing MOBA games.
Finally, the GPU. This was the item I spent the most time deliberating due to so many available options. For my budget, I could have went with either the GTX 960, 970, 980, or the R9 290, 290x, 390, 390x. I spend the majority of my gaming time playing MOBAs such as Dota or HotS. While I would like to play some of the latest titles at Ultra-High settings, I don't consider myself enough of an enthusiast to really enjoy the difference between 60 FPS and 50 FPS. This is how I made my decision. While I could have bought a 970 for about $100 extra, I'm not running a 144hz monitor to truly appreciate the difference. I intend to eventually upgrade to a 4K monitor with my current setup, but none of the GPUs in my price range could produce playable framerates at 4K anyway. I'll some a few bucks and wait until next year to upgrade. As for the R9 cards, the additional power consumption cost is significant enough that I might as well spend a bit more on a higher tier Nvidia card. So I went with the GTX 960, silent and efficient to complement my build.
The build was quite easy and took me around 3 hours with my limited knowledge of hardware. If I had read the instructions on installing the liquid cooler backplate, I could have likely saved myself another hour. Since it is a Corsair liquid cooler with a Corsair case, everything was compatible. I didn't have to remove the case fan and replace it with the cooler fan, since they were the exact same dimensions and same hole placement. The motherboard was actually the most cumbersome to install due to the bendable metal tabs on the I/O shield. Plugging in the power supply cables was super easy and ergonomic due to the dual chamber design. I am fully convinced now that modular power supplies are worth the extra cost.
The only drawback of the case was the lack of an optical drive slot. I didn't think it mattered since we're approaching the year 2016, but I was wrong. I was thinking of just downloading all the drivers from the motherboard's website. The motherboard's drivers came in a DVD, and without it I couldn't install the network driver to access the internet. I could have burned the DVD to a USB on another computer, but that seemed like a hassle so I went with the more direct approach. The cables were just long enough to connect both the power supply and SATA to my old optical drive, which I rested on top of the case. It worked, and life went on.
I am more than pleased with my new machine's performance. The liquid cooling enables the CPU to stay around 30 C at idle and no more than 45 C under load. The GPU maxes out around 63 C under load. It stays extremely silent during operation and I can't notice any heat output either. Simply stated - it's efficient, clean looking, and produces more than enough oomph for what I require.
My desk is the Ikea Fredde. It's very spacious and ergonomic, and allows me to rest my forearms on the desk while typing or gaming. It has hangers in the back for headphones and cables, enough ledges for multiple routers/speakers/whatever, and an adjustable monitor stand. For $200, it's well worth it. I'm extremely satisfied with my new multimedia entertainment setup and consider this project to be an overall success. In the future I intend on upgrading my GPU and adding either a 4k or ultrawide monitor.