So, as it was my birthday yesterday I have some spare cash and was thinking about upgrading my pc, my spec is:

i7-2600k @3.4 Ghz
8Ghz DDR3 667 MHz Ram
Radeon 5770 Graphics
2 x 500M HDD
Windows 7 64 Bit

Now I need to upgrade at least 1 HDD as my Steam folder is only getting bigger, so I was going to go for a http://www.novatech.co.uk/products/c.../wd20ezrx.html

My question is should I go for 16G RAm or a new Graphics card? I'll probably move to Windows 8 soon and I'm also not sure about a SSD for my main HDD.

Any cunning ideas (Cue Hus calling me a noob)?