Different PSU? you betcha!
Most PSU's that come with cases blow hard. The source of your pride and joy's power should not be relegated to some panty-waist power supply, especially with the combined power requirements of todays hardware.
Also consider the exhaust. I noticed that it has an 80mm, though not bad, most 120mm fans can move more air at lower RPM's = quieter Rig.
In addition there seems to be no intake on the front. a simple case mod to any drive bays that are unused can remedy that.
[SIZE=\"1\"]E6400 @ 3.4 , Noctua 120
7900GT @ 670/1680 , VF900
2 x 1GB Patriot 6400 @ 425
WD SATA 250GB
Neo HE 550
P180 / G15 / MX1000[/SIZE]