what PSU do I need for this setup?

Hi.

Hope somebody can help me out.

I was looking into a 550w powercooler (two 18A 12v rails) or antec PSU (three 18A 12v rails) for my new rig. Some say it's enough and others that it is not.

Here are the specs:

1 intel e8500 oc'ed to 3.8 (hopefully)
1 asus p5q-e
1 sata 750gb seagate
1 nvidia geforce 9800GT
2 x 2gb = 4gb of OCZ 1066
1 DVDRW
1 ARctic freezer 7 with 92m cooler

and the usual stuff... couple of USB devices plugged in here and there...

I used an online calculator and got 387w.

what do you guys think?

btw: is one 12v rail with 60 amps better than 3 o 4 with the amps divided amongst them?

thanks.

mininum watts for the antec, jtt283?

550-600? I really don't want to overkill it with a 850w 4 rails psu. although the 850 antec is 139 at newegg about 70 bucks more than the 550

550w would be plenty for that system, sure get the 850w if you have the money and want something down the line but the 9800gt doesnt have a big power draw.

Single rails are supposedly better.

Those 3 PSUs, are very good quality ones compared to the Antec550w (not that its bad). The 550w should be enough , but if you want a bit more grunt for the future and you have the money id grab the Corsair 750w you mentioned.