Small mITX AMD Build Critique

I'm set on mITX for my next build. It'll be an HTPC and Steam Box for the living room. I've done some Intel/Nvidia builds, and they've been great, but it's been a while since I put together an AMD build. Thoughts both ways, but the idea of switching it up seems appealing. The only snag is that I don't see any AMD mITX motherboards supporting their better CPUs (e.g. FX-9590) on the AM3+ chipset. If I do an all AMD build (or if it's possible), I'll hold off on the GPU until the next round of top cards come out. The R9 290x isn't worth buying new right now if the next flagships come out in Q1 of 2015.

For now, I have a few outlines put together on PCPartPicker. Hopefully you all can give some feedback.

Intel Ideas

Hardon Case
Here's the first of two, which are pretty much the same except for case choice (this one's in EVGA's Hadron Air):

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Newegg)
CPU Cooler: Noctua NH-C14 CPU Cooler ($73.69 @ Amazon)
Motherboard: Asus MAXIMUS VII IMPACT Mini ITX LGA1150 Motherboard ($214.99 @ SuperBiiz)
Memory: Mushkin Redline 16GB (2 x 8GB) DDR3-2133 Memory ($134.99 @ Newegg)
Storage: Samsung XP941 Series 512GB M.2-2280 Solid State Drive ($500.98 @ Newegg)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($101.99 @ Newegg)
Video Card: EVGA GeForce GTX 980 4GB Superclocked Video Card ($629.99 @ SuperBiiz)
Case: EVGA Hadron Mini ITX Tower Case w/500W Power Supply ($105.98 @ Newegg)
Optical Drive: Silverstone SST-SOB02 Blu-Ray/DVD/CD Writer ($144.99 @ Directron)
Operating System: Microsoft Windows 8.1 Professional (32/64-bit) ($170.99 @ Adorama)
Total: $2370.58
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-14 11:16 EST-0500

Raven Case
This one's similar but in Silverstone's mITX Raven:

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Newegg)
CPU Cooler: Noctua NH-L9i 57.5 CFM CPU Cooler ($44.49 @ Newegg)
Motherboard: Asus MAXIMUS VII IMPACT Mini ITX LGA1150 Motherboard ($214.99 @ SuperBiiz)
Memory: Mushkin Redline 16GB (2 x 8GB) DDR3-2133 Memory ($134.99 @ Newegg)
Storage: Samsung XP941 Series 512GB M.2-2280 Solid State Drive ($500.98 @ Newegg)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($101.99 @ Newegg)
Video Card: EVGA GeForce GTX 980 4GB Superclocked Video Card ($629.99 @ SuperBiiz)
Case: Silverstone RVZ01B Mini ITX Desktop Case ($91.98 @ SuperBiiz)
Power Supply: Silverstone 600W 80+ Gold Certified Fully-Modular SFX Power Supply ($117.99 @ Directron)
Operating System: Microsoft Windows 8.1 Professional (32/64-bit) ($170.99 @ Adorama)
Total: $2300.38
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-14 11:25 EST-0500


AMD Idea

Raven Case
Since I don't see an option for an AMD based CPU in the mITX form factor, I thought maybe one of these would be good once the new AMD GPUs come out. My only concern is that the PSUs on these small systems can't push more than 600 watts, which brings the current generation of R9 cards like the 290X into question (a little), but fingers crossed for better power efficiency with the next round of cards. That also eliminates the Hadron as an option because it's limited to 500w. Another concern is that there are no good blower coolers for the 290X, which would be nice for a small build like this.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($299.99 @ Newegg)
CPU Cooler: Noctua NH-L9i 57.5 CFM CPU Cooler ($44.49 @ Newegg)
Motherboard: Asus MAXIMUS VII IMPACT Mini ITX LGA1150 Motherboard ($214.99 @ SuperBiiz)
Memory: Mushkin Redline 16GB (2 x 8GB) DDR3-2133 Memory ($134.99 @ Newegg)
Storage: Samsung XP941 Series 512GB M.2-2280 Solid State Drive ($500.98 @ Newegg)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($101.99 @ Newegg)
Video Card: Sapphire Radeon R9 290X 8GB Vapor-X Video Card ($479.99 @ Newegg)
Case: Silverstone RVZ01B Mini ITX Desktop Case ($91.98 @ SuperBiiz)
Power Supply: Silverstone 600W 80+ Gold Certified Fully-Modular SFX Power Supply ($117.99 @ Directron)
Optical Drive: Silverstone SST-SOB02 Blu-Ray/DVD/CD Writer ($144.99 @ Directron)
Operating System: Microsoft Windows 8.1 Professional (32/64-bit) ($170.99 @ Adorama)
Total: $2295.37
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-14 12:55 EST-0500