Occasional gaming (Everquest 2, Elder Scrolls Online), heavy photo-editing (Photoshop, Lightroom, NikWare, OnOne, etc.), light word-processing. Note: for some reason, this site doesn't offer as a part option the model(s) of the GPUs I actually used, 3 X EVGA GeForce GTX 780 Hydro Copper Classified (in 3-way SLI and cooled with the EK-based liquid cooling system). Go here to see part: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130923 Haven't made any inroads yet w/r/t overclocking -- still getting to know the machine.
After checking out several listed builds, I've kinda gotten the impression that people generally put a little more detail into the written description, so...
I first decided to build this machine (not my first build, but my first solo build; I've participated in quite a few but never had the nerve to try things on my own) when my old PC crapped out and I found myself forced to use my old (and cruddy) laptop for everything. Most of my income is based on freelance photographic work and trying to edit huge image files proved to be incredibly slow, frustrating, and ultimately, unreliable. I'm not much of a gamer (I enjoy playing Everquest 2, mostly as a social thing, but the truth is that I don't have much talent in that area -- I've been trying to get into Elder Scrolls Online, as the majority of my EQ2 friends are jumping ship, but so far I haven't really been all that impressed. The only other game I enjoy is Left 4 Dead 2, but I haven't gotten around to installing it on the new machine as I've been so busy with work crap) but my somewhat limited experience has taught me that the same attributes that make for an effective gaming PC tend to also work for the methodology I employ with my photographic work. Also I read a lot of computer magazines aimed at the gaming demographic, and that's largely where I became familiar with the current generation of high-end parts. My first purchases were the GPUs (picked for ease in liquid cooling integration as well as SLI compatibility -- my last PC had 580s in triple SLI, and I thought it was one of the more effective graphics solutions I'd used), followed by the motherboard (couldn't decide between the rampage and the sabertooth... in the end, I opted for the rampage because between the two, I found more positive reviews of the former), followed by the CPU (OK, OK... that was just hexacore bragging right envy. No sound logic went into that.) After that, I got the ram (I like Corsair; not exactly flashy, but definitely reliable). Next came storage: I decided to use one SSD for the operating system, one for my most frequently used software (ie photoshop, lightroom, etc.), a caviar black for remaining programs and current photographic project files, and a large caviar blue for the bulk of my images. I suppose that's a bit on the weird side, but it actually works out fairly well. After all that the only crucial pieces remaining were the cooling system and case choice. I went with EK for the cooling only because that's what I used last time, and it functioned perfectly all the way to the end. I bought the 360 kit, but ended up using some bits and pieces I scavenged from the computer repair place I work at part-time. In retrospect, I probably should've used white tubing and distilled water instead of clear with red coolant. Oh well. No biggie (I hope). Case was easy -- I bought the biggest one I could find that was a reputable brand and didn't look like something from the Star Wars lost and found bin. PSU was a no-brainer, the soundcard was a gift, and everything else was scavenged from the shop.
Last thing (at least for now; I'm getting sick of this): I opted for win 7 instead of 8 simply because I don't like being bullied into using whatever half-baked creation Microsoft develops as part of their ongoing effort to lower the world's collective IQ another ten points. I don't like the interface; I'm not a fan of purple; and Chrome is criminally annoying.
OK, enough for now.