opinions on this build

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8gb wont make much of a difference. Also the Ultimate is not as tried and tested as the Premier but i dont think it should make much of difference either.
The ram i included in my list looks aesthetically better and also cheaper but it doesnt matter either.

Anyways, you should be good with this.
Refined it a bit for better ram/psu/ssd/gpu...

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor ($191.91 @ Jet)
Motherboard: MSI B150M PRO-VDH Micro ATX LGA1151 Motherboard ($64.99 @ SuperBiiz)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2133 Memory ($79.99 @ Newegg)
Storage: ADATA Premier SP550 120GB 2.5" Solid State Drive ($42.89 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.78 @ OutletPC)
Video Card: Gigabyte GeForce GTX 1060 6GB 6GB WINDFORCE OC 6G Video Card ($249.99 @ Jet)
Case: Thermaltake Versa H15 MicroATX Mid Tower Case ($34.99 @ SuperBiiz)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($52.89 @ B&H)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.88 @ OutletPC)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($88.58 @ OutletPC)
Total: $874.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-12-09 22:42 EST-0500

 
You have no bad choices there. More eyes on it might spot slightly better deals, or other niggling changes, but hopefully people will resist believing they need to put their marks on your build. The only thing with which I cannot imagine anyone disagreeing is to get a 2x4GB (or 2x8GB) RAM kit in order to run in dual-channel mode. The difference may be small, but it shows up in some tests and might make a few FPS' difference in CPU-bound games. With four DIMM slots, you could stay with 2x4GB if you're concerned about cost, and still have two slots free to add more later.
Edit: I prefer the original SSD choice; it's a MLC drive, vs. ADATA being TLC, which may have lower endurance, and will have lower write speeds once its cache fills. I haven't seen the Glacier reviewed yet, but the Seasonic, though good, is not modular, and may not support S6 and S7 low-power states.
 
The Seasonic has specific shortcomings. Do you have evidence as to why the Glacier is not good? I see no reviews posted for it, so it's an unknown, but no worse than that. He's not going to be stressing it, so it should be fine.
I like Gigabyte too, but wouldn't turn my nose up at PNY just for being PNY; I may have owned one or two of their cards a long time ago but don't remember any problems.
 
I have had PNY cards failing on a couple of builds i made, and since then i never suggest it.
As for the Glacier, you are right its unknown. But why choose a unknown unit over a known and proven/tried and tested unit around the same price range??? Doesnt make sense.
 
Dual channel is always better. Simple logic, two taps can fill the bucket faster than one. But the thing is, 16gb is fast becoming the norm as 8gb may not be enough at times. Games like BF1 recommends 8gb already, and in future the games will get more and more demanding. Bear in mind that your pc also uses additional ram for other background operations while you are running any apps or games.
120GB SSD should be enough if you are not storing your games on it. That said SSDs do not improve gaming performance. It only improves load times. That is, you wont get more FPS but when you go to a new map, it will load faster.
 
I would get dual channel. A 2x4GB kit won't break your budget, and still leaves two slots free for another 2x4 (or 2x8) later.
I consider 120GB too small in a general-use PC; in fact I'm using over half my 512GB SSD in my main PC. I do have a 120GB drive in my "lab assistant" PC, but it has few programs on it since its primary jobs are to serve as a target system for LAN throughput tests, and I can grab screenshots and record results on it while I'm running my tests, or even kill a few zombies. For general use though, I probably wouldn't be "suffering" with a 250GB-256GB drive, but it is convenient having more.
The new Corsair CXM PSUs (NOT the older CX) have reviewed well, are modular, S6/S7 compatible, and are perhaps another $5-$10. It was excellent in its day, but that particular Seasonic has been left behind by advancing technology.
Once again, the original build had no bad choices; a 2x RAM kit is a change to which anyone I know would agree (a 1x kit might make sense on a board with only 2 RAM DIMMs, with a plan to get the second later), but the rest was fine.
 
8gb wont make much of a difference. Also the Ultimate is not as tried and tested as the Premier but i dont think it should make much of difference either.
The ram i included in my list looks aesthetically better and also cheaper but it doesnt matter either.

Anyways, you should be good with this.
 
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