A generation or two old, and besides the dust it doesn't show.
This is my rig. There are many like it, but this one uses superglue, nerf foam, wood, and rubber bands to operate, and yet laughs at anything 1080p. The most recent upgrade was the wood and plexiglass HDD brackets which keeps the WD Blacks a whopping 25C cooler than in the X-Docks. Much quieter as well due to foam mounts.
The 3570k is still top-notch, and any margin the i7's or Haswell systems have over it can almost be made up if I overclocked a touch more. The MSI Z77 Mpower's only flaw I've run into is that the wireless chipset is just a USB stick with an antenna (boo hoo, I still game on it when needed), and that the system posts inconsistently with the fast boot options on. With fast boot off and using another NIC, it's fantastic. G-Skill's still works as advertised, which is all you can expect from RAM.
With the recent issues with Samsung's TLC SSDs, I might suggest another product. Admittedly, I haven't noticed any strange behaviour even with the old firmware, they're crazy fast and the Windows 8 boot spinner only gets around once before I hit the login screen. WD Blacks are the only HDDs I suggest as boot drives, because they're cheap and fast as sin. ~230MB/s file transfers are typical in Windows software RAID0. Who doesn't like a 5-year warranty?
Zalman's CNPS10X cooler is dandy, and it's shorter than a Hyper 212 so fits in smaller cases nicely. I still have clearance to put a 200mm fan up top, but a Hyper212 wouldn't. It blocks 1 RAM slot. The stock fan was replaced with a Bitfenix SPro simply because the heatsink is so powerful that the fan doesn't ram up during prime95, so I put in a slower fan for noise. I don't like the mounting, if you get frustrated easily get a Hyper 212.
The HAF-XB is more work to build in than a tower. If you want to change an internal HDD, add a GPU, or many basic tasks you need to pull the mobo. Once it's built, you have DIRECT airflow on the GPU and CPU heatsink, so temps are awesome.
Power supply fan never kicks on at idle. I sleeved the cables with 550 black paracord which adds some bulk to the cable mess in the basement, but it make getting around the narrow bend easier than the original sleeved bundles. I haven't gone so far as to test the efficiency, but it's cool to the touch when the CPU and GPU are loaded.
I love those Benq displays. Awesome colour depth! I've got the primary one overclocked to 66Hz (10% is better than nothing!) and the very mild motion blur makes it much less harsh than a TN panel. The PVC frame holding them keeps the displays perfectly at eye-level and close without consuming desk space. Comfortably fits a 15.6" notebook in the gap below. I really ought to paint the frame, but it would require my PC being pulled apart for a couple days.