This is my first ever PC build. I'm mainly using it for gaming, recording video, editing/rendering video and audio, and producing.
My budget was about $1000, and the main thing I wanted from it aside from what it could do was that it had to be quiet (no windows or LEDs here).
It runs almost everything I throw at it at maximum settings, native resolutions, with the exception of less optimized titles (Arma II, anybody?).
The reason I went with the 1 x 8GB RAM is because it came bundled with my mobo for free. If need be I can just buy another stick of the 8GB, although the system runs fine with this config, the only practical application I could see to justify having 16GB of RAM would maybe be for rendering video, although I don't think there'd be much real-world difference.
The cable management is pretty sloppy, I'll admit. Once I get a CPU cooler (which is a low priority for me right now) I'll probably hook up the fan controller, freeing up some clutter over the mobo in terms of wires.
The SSD drive works fantastic - my computer boots in less than 10 seconds, and as of now, I can't foresee any problems with having it only be a 64GB drive. I've filled it to about half capacity less than a week after building it, but I don't think I'll need to fill it with anything else.
The other thing I was worried about when I was building this was the PSU - after purchasing it, I began to hear people saying that 430W wasn't enough to power this thing. But PCPartPicker clocked in my system at 311 volts, and I used another website to calculate it, and although I don't have as much headroom as I would like, it's still a solid choice.
Overall, I'm extremely happy with this machine, I spent a lot of time going over other people's builds and choosing parts to fit my needs, and in the end I worked for about a month to be able to afford all the parts.
Changes I might make in the future are obviously getting rid of the stock heatsink in exchange for an after-market CPU cooler, replacing the stock Fractal case fans in favor of some Corsair or Noctua silent fans, and moving my HDD to somewhere with more airflow (it can get warm, which is concerning for me).