Simple and Elegant.
Decided to go AMD route as done fair few Intel recently.
Used the X4 860K which is basically A10 7850K without the onboard APU.
Choose the Palit Jetstream version purely as I have used both GTX 970 and GTX 980 Jetstream versions lately and they are some of the fastest Overclockable ones on the market, just shame cooler is on the larger side (Almost Triple Slot)
Case is the Inwin 901. Its ITX format only with solid 1 piece Aluminium with Tinted Glass Side Panels. Very nice case and fairly easy to work in. Air flow is major flaw. You have 120mm intake and bottom and room for 90mm Rear Exhaust fan. Obviously in this instance I have mounted Cooler internally which completely obscures the already hidden IO back panel of motherboard and restricts the amount of space further for plugging in all required cables, but in this instance I have used angled extension cables for USB and separate powered USB 3.0 Hub.
Processor clocked to a modest 4.4GHz and with the AIO Corsair cooler is pretty quiet. To mount the Radiator internally (Inwin advertises the cooler to be mounted externally) I have used a Raijintek Aeolus 13mm PWM Slim fan, runs extremely quiet and even full speed is only 1400RPM. Fits inside nicely, some not too cramped. There is enough room to mount a second fan for push/pull If you desire, only issue in this would be access to usb sockets on rear of motherboard. You can buy angled version but the usb plug is still a decent length out of the rear Panel. Easiest solution, decent USB 3.0 AC powered Hub form one of the 2 front USB 3.0 sockets.
Airflow as always with this case is problematic. The PSU fan is on top and as its directly under Graphics card is the air intake for PSU is already warm. Choose the GTX 960 over anything else as the heat from this card is minimal even under load. It pays to get the best fan for your money, needs to be PWM for added user control and high airflow at minimal noise.
Asrock Motherboard used over any other ITX version from likes of Gigabyte, MSI due to fact is the half height slot mini PCIE slot also takes SSD, the other Manufacturers ITX versions are purely for half height wireless card only. Using mSATA SSD tidies up the build and means less cable and clutter.
Gaming Wise, you are fine with anything at 1080p, even 1440p is possible in some games.
Not tried anything out on this as yet, been sat on my desk for a week and only managed to install OS and 6 hours tress test so far and check everything functioned. Though you can get the jist on performance, GTX 960 decent all rounder, faster than an R9 270X overclocked it is just as good as GTX 770 and is tit for tat with the new R9 380. AMD X4 860K is as good as any i3 processor.