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You mean the hardrive by "storage device"? If so, yes you can, but you will have to re-activate windows 7 because you will have new parts and windows don't like that. But you might be able to use both hdd(did not bother to looks at motherboard specs). At least, you can keep your 400gb of stuff to download :)

You will need to wipe your hard drive and reinstall Windows (at least with windows 7 that is, I don't know or care about 8 lol). Hard Drives are not Plug and Play with the BIOS yet, at least in my experience.*

I just upgraded my system, pretty much a brand new build Mobo/CPU/RAM/Case/Power Supply/DVD Drive, at Newegg it was around $600 for an FX8350 Black, 16GB Ram and all that jazz. I love the FX8350 Black and you could save about $100 over the 4690k unless you are heartset on Intel.

EDIT - http://www.newegg.com/Product/Product.aspx?Item=N82E16819113284 here's the CPU I was talking about.

*You can use the Windows System Prep but if you do not have a Genuine copy of Windows I doubt you can use this.

It seems pretty good. Maybe you could go for a better GPU, but a R9 270 is ok.

Nope, upgrade to this

No idea why did you replace the Intel CPU with an AMD cpu. i5 performs way better than those AMD CPUs in games. Just saying.

I recommend you to take a look here, great site :]