Looking for upgrade opinions

[wafflz]

My current important parts of my setup are as follows.

Hard drive: WDC WD6401AALS-00J7B1
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319

Memory: Corsair Vengeance 8 gig 2 x 4
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233186

Graphics: EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi) 1GB 256-bit GDDR5 PCI Express

2.0 x16 HDCP Ready SLI Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130604

Monitor: Acer S231HL (analog) 1920 x 1080
http://www.amazon.com/Acer-S231HL-23-Inch-Widescreen-Ultra-Slim/dp/B003N7P6TC

CPU: i5-3570k (not overclocking)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504

MOBO: ASRock Z77 extreme6
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157295

Power: Ocz Fatality 750W 80+ Bronze
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341041

I build this on a budget last year, and i reused a old hard drive to save a few dollars, I have windows 7 home premium 64 bit. Primary use is gaming including several genres from MMOs like World of warcraft to flight simulators like DCS a-10c.

What I want to upgrade

The hard drive, I want to stay away from SSDs and probably stick to around 100 dollars. I am looking at something like http://www.newegg.com/Product/Product.aspx?Item=N82E16822136533
Is it going to provide that much of a difference though? I would not need anything over 1TB.

Graphics card. I have two of the stated 560 ti, but I am not interested in running them in SLI. My current thought is to sell the both of them and get this
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130922&Tpk=evga%20gtx%20770&IsVirtualParent=1
From what I understand in my current resolution i would not need more then 2 gigs of VRAM.

Also perhaps the monitor, which I have not put much thought into as of yet, but I would stay in the same resolution.

Other peripherals are good to go and I am not worried about any of them.

I like to buy from in store at microcenter, or of course newegg.

 

[tiny voices]

There will be no difference in performance at all with hat HDD. just more space.

The GTX 770 is a great card and would be a nice upgrade.

 

[wafflz]

Yeah that is what I was thinking. Unless i go SSD i wont really notice much of a difference. But that card scores significantly higher then my current one, and should provide a nice boost to fps in gaming. I am not worried about my i5 either, havent seen it maxed out during a game yet.