Well so far the mobo is working just fine actually, what would be a reason to upgrade to that one?
And the PSU you linked to, it's got 2 +12v thingies, but both do not go over 20A, I'm a newb to this, but wouldn't that mean that if I can only plug one of those into my video card, it would run low?

Well read some reviews, seems like I shouldn't worry about that. Anyway, it's a good 40 euros more expensive, so I have to consider it...
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PC Specs:
CPU: Intel E4400 @ 2.66GHz
GPU: ATi HD4870 / 512MB / Core: 775 / Mem: 1025
Mobo: Gigabyte EP35-DS3 (rev 2.1)
SPU: Creative X-Fi Xtreme Music
RAM: 2GB Corsair XMS2 DDR800 @ 4-4-4-12 ~ 800MHz
HDD: 320GB Western Digital 16MB Caviar SE
PSU: Hiper Type-R 580W
Geometry Wars: 198.400
Lumines: 523.879
Rip: Cid's Bleemcast 28-08-2007
X360/Wii/PS3 belong to the current generation, update your mindset FFS