How best to use $500?

Hardware Build a PC
1

im getting $500 back for uncle Sam and would like some assistance with picking out what to spend it on 

i need a gpu for this system  http://pcpartpicker.com/p/35m2K 

i need a decent wired mouse for a fingertip grip type

if both are descent at a price point of $450 ill donate the last $50 to the teck

   

2

 Really I'd spend all of it on a GTX 780.

http://pcpartpicker.com/part/evga-video-card-03gp42784kr

3

Maybe an Asus 770 DCUII. Don't know about a mouse though

4

im only running a single monitor so a 780 may be a overkill item right now 

5

 GPU: I'm a big fan of my EVGA 780 Classified and the company has some of the best customer service I've come across (as compared to Gigabyte, Asus, and MSI) This is a superclocked version of the GTX 770, not the fastest, but a quality card... Rated 5 stars on Newegg through 208 reviews...

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130921&clickid=wCuT0nVEvW2GWQezUl348yk4UkTR4o1VyXWcxE0&iradid=97618&ircid=2106&irpid=79301&nm_mc=AFC-IR&cm_mmc=AFC-IR-_-na-_-na-_-na

 

Mice: Both of these are just awesome feeling, very ergonomic mice... the Mionix has a few more features and customization options...

Mionix Avior 8200:

http://www.amazon.com/dp/B00D3F7D86/?tag=pcpapi-20

Razer DeathAdder:

http://www.ncixus.com/products/?usaffiliateid=1000031504&sku=78286&vpn=RZ01-00840100-R3U1&manufacture=Razer&promoid=1285

6

gtx770 + another HDD + mouse

http://pcpartpicker.com/user/deejeta/saved/3Yvf

7

http://pcpartpicker.com/p/35rwy

way over but i have a birthday this month  

8

4GB of the 770 see little, if any, improvement if you're only gaming at 1080.  Go for the 2GB version instead.

I personally would never buy a membrane keyboard for over 15 bucks.  Go mechanical, since you already have a mouse you seem to like.

http://pcpartpicker.com/p/35xxQ

Add the Define R4 if you want.