Corsair Builder CX500 €52
Corsair Builder CX430 €43
XFX Pro 450W V2 €52
Which one to pick
If you really think the 430w Corsair one is good enough I will just get that one, but would I get a performance boost whatsoever with the others?
No performance boost for the more expensive PSUs and the CX430 is definitely sufficient for your PC. Check prices on the Antec VP450 and the Enermax NAXN82+ model ENP450AWT B. Choose the least expensive of those and you'll be good. The CX430 is a great deal in the US, too; can usually be bought for $20-25 after a mail-in-rebate.
The lowest rated Fatality PSU the 550W since the 400W was discontinued. Not to mention that not all of the Fatality PSUs are of the same quality; it's a mixed bag. If going that route, then I'd stick with the Corsair Enthusiast but that is not what the OP is looking for....OP is looking for an inexpensive but decent quality PSU. In the OCZ lines the ModXstream PSUs best fit that description. The OCZ ModXstream 400W has been discontinued and the 500W will be more expensive than the CX430.