-CPU: Intel Core i3 2100 3,1 Ghz SandyBridge LGA1155 Boxed---- 110€ (cheapest decent i3 CPU, wouldnt suggest getting anything lower)
-MOBO: ASUS P8P67 (Rev. 3.0) LGA1155---- 120€ (cheapest decent i3 MOBO, wouldnt suggest getting anything lower)
-GPU: GeForce GTX 560 (1024MB GDDR5)---- 160€ or PALIT GeForce GTX 550 Ti (1024MB GDDR5)---- 110€ (depends on how much money you got, the difference isn't that big anyway)
-PSU: Corsair 750W CMPSU-750TXEU---- 100€ or Any PSU @ 600W or above (a quality one is highly suggested tho since a Corsair 600W one couldn't handle my GTX470@2GB, doubt it can handle any of the above GPUs)---- might go down to even 50-60€
keep your old RAM (better if you got 4 or 6 gb, just make sure they're DDR3... but a 2GB DDR3 RAM stick is like 15€ anyway), old case & old mouse & keyboard, etc.. shizzle, 450-500€ and you got a pretty good PC for gaming
EDIT: added even cheaper solutions next to the suggested ones, just in case 450-500€ is too much (you won't go under 380-400€ anyway, even if you choose parts that are cheaper than the ones suggested)
-MOBO: ASUS P8P67 (Rev. 3.0) LGA1155---- 120€ (cheapest decent i3 MOBO, wouldnt suggest getting anything lower)
-GPU: GeForce GTX 560 (1024MB GDDR5)---- 160€ or PALIT GeForce GTX 550 Ti (1024MB GDDR5)---- 110€ (depends on how much money you got, the difference isn't that big anyway)
-PSU: Corsair 750W CMPSU-750TXEU---- 100€ or Any PSU @ 600W or above (a quality one is highly suggested tho since a Corsair 600W one couldn't handle my GTX470@2GB, doubt it can handle any of the above GPUs)---- might go down to even 50-60€
keep your old RAM (better if you got 4 or 6 gb, just make sure they're DDR3... but a 2GB DDR3 RAM stick is like 15€ anyway), old case & old mouse & keyboard, etc.. shizzle, 450-500€ and you got a pretty good PC for gaming
EDIT: added even cheaper solutions next to the suggested ones, just in case 450-500€ is too much (you won't go under 380-400€ anyway, even if you choose parts that are cheaper than the ones suggested)