GIGABYTE GA-990FXA-UD3 and AMD FX-8350 Black Edition upgrade options

I built this system January 2015. When i built it My buddy Helped me pick parts based on price vs performance. At the time he said that the 8350 was the pest cpu I could run with the board. He has a family now so He doesn't have much time to tinker with things like this anymore So picking his brain with this isn't something I'm going to wast time with.

PARTS.

MOBO
GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX + SB950 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128514

CPU
AMD FX-8350 Black Edition Vishera 8-Core 4.0 GHz (4.2 GHz Turbo) Socket AM3+ 125W FD8350FRHKBOX Desktop Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819113284

GPU
ZOTAC ZT-90102-10P GeForce GTX 970 AMP! Omega 4GB 256-Bit DDR5 HDCP G-SYNC Ready Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814500363

RAM
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBRL
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314

COOLER
CORSAIR Hydro Series H110 Extreme Performance Water/Liquid CPU Cooler. 280mm
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181035

PSU
EVGA SuperNOVA 750 G1 120-G1-0750-XR 80+ GOLD 750W Fully Modular Includes FREE Power On Self Tester Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438027

SSD
PNY Optima 2.5" 480GB SATA III Internal Solid State Drive (SSD) SSD7SC480GOPT-RB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820178742

MASS STORAGE
HGST/Hitachi Ultrastar 7K3000 HUA723020ALA641 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Hard Drive
http://www.newegg.com/Product/Product.aspx?Item=1Z4-001J-00078

CASE
NZXT Phantom 820 Series CA-PH820-M1 Matte Black Steel / Plastic ATX Full Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=9SIA4M53YT3932&cm_re=nzxt_phantom_820-_-11-146-097-_-Product

OS
Windows 10

I'm looking to upgrade this system over the next 6 months. I don't have a set budget. I'm more looking for things To keep an eye out for when I look for things like daily deals on the egg. I know the mobo can use 32 gig of ram. the ram would probably be the first thing to upgrade. I was thinking 2 8 gig sticks first unless I found a good deal on quality ram set. from my understanding I can run different ram. like 2 4 gig sticks and 2 8 gig sticks but the mobo will only recognize the slower ram speed of the 2 sets? If i remember right the mobo didn't recognize the full 1600MHz of the ripjaw ram. I don't remember what it saw it as but I think It fixed when I went to windows 10.

I believe there are better cpus that will work with the mobo but that is Where I scratch my head. If I could get just as good performance or better from ocing that would be something I would be willing to learn. I just don't Understand what makes one better that the other I would assume its based on gig but I have read that isn't all there is to it. i know the board supports different chip brands as long as it is the same socket. I'm just leery because i bought the wrong cpu for a pc years ago and couldn't return it.

With video cards from what I can tell manufactures don't drop prices much when new ones come out but they phase them out so I don't know if its more realistic to sli or sell and upgrade. Im jot against used parts as long as its from a site that can facilitate returns and issues like ebay does. My buddy also said That I can oc the gpu as well. same thing I have never messed with it.

I also have a Power supply I was given by another friend who never ended up building a system. same with the case. its a xfx pro series 1250 watt gold. He gave it to me because he couldn't find any of the modular cords. When he gave it to me I didn't have time to look around for cords and everyone said that the manufactures customer service sucked and I didn't have time to dick the dog. I read conflicting things about getting after market ones but I don't know.

Any and all info would be greatly appreciated.