All of these power supplies have enough power for my purposes, expect that OCZ has even greater amount of power, meaning that in the future it would have lots of space for even dual gpus! But that is not a necessity, have to keep that in mind.
Anyway, give me your opinions and if you have a better suggestion, then tell me!
Early thanks for all your replies!
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Or should I instead take XFX Core Edition PRO 550W for 59,90€? It's manufactured by Seasonic unlike the other psus.
Indeed, get the xfx 550 pro, it's better than those units, it's made by seasonic.