How to speed my PC up?!

[Admiral Huddy]

Links are broken

I would suggest both SSD and card but in any order of your preference... SSD for general loading and performance. New card for better FPS in games

 

[AcEYY]

This is a great for under £300 and i certainly wish i bought one instead of the 670 i bought.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-097-GI&groupid=701&catid=56&subcat=938

next down from that is the 7950 coming in under £240
http://www.overclockers.co.uk/showproduct.php?prodid=GX-098-GI&groupid=701&catid=56&subcat=1673
This will certainly play all your games at 1920 at decent settings

These were the two cards you suggested. What would be best for the LED 120Htz BenQ i would be getting?

 

[Idleman]

A cheaper option, depending on your mobo, would be a 2nd hand 560ti and sli it with your existing card.