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I've ordered this PSU - Corsair 520W HX V2 Series Modular PSU and I'm gonna order this Graphics Card http://www.overclockers.co.uk/showproduct.php?prodid=GX-044-EA&groupid=701&catid=56&subcat=1008 on monday.
Thanks to everyone who helped me.
.Hope you enjoy the new boost in graphic power
I've measured my current PSU's wide, length and height and it is almost the same as the one I've ordered so it should fit. Hope the graphics card will fit as well. My current one is about 18 cm long I think but there is space in the case 
