For HTPC, I think the best way to go is to use the Intel Ivy Bridge combined audio video processors.
I built an HTPC just over three years ago using the Ivy Bridge i5. I have been really pleased with it, especially since migrating to Windows 10.
In our other residence I have added an Intel NUC using the Ivy Bridge i5. If you are not a gamer the i5 is fine. If you are a gamer you might one to use the i7.
The Intel NUCs are a little spendy but their build quality is excellent. If you are like me then you will find these devices are your most used peripherals. I hate junk and low build quality devices. It is well worth taking the high road in my opinion.
I think Windows 10 and Ivy Bridge is the best available in the HT environment and that is my recommended choice for you.
My HTPC
The HTPC is the unit in the right rack above the grey UPS. The computer in the left rack on the UPS is my DAW. The blue unit is the DAC for it.
My Intel NUC.