What Wattage PSU do I need?

[OzyOly]

Ok, I'm deciding between which PSU to get;

Seasonic 600w and Seasonic 500w from this site.

Here are my specs;

Athlon X2 4800+ (2.4GHz, 2Mb Cache)
DFI LANPARTY Expert Board skt939 (On this site)
2GB (2 x 1GB) Corrsair XMS3500LL Pro TwinX RAM
ATI Sapphire X1900Xt-X 512Mb GDDR3 Graphics card.
Hitachi 250GB SATA 2 7200rpm (may get another Harddrive soon after 10k rpm may be?)
Auidigy 4 sound card
Wi-fi network card (125mbps)
DVB-T TV card.
2 blue cold cathodes
4 SilenX (ultra quiet) 80mm fans (2 of those are 4 LED fans)

Extras if you wanted to know;

2.1 32w speaker set
Samsung 19" syncmaster 4ms TFT.
Biometric keyboard and wireless optical mouse (m$)
Xp pro (may get MCE 05)

Anyway will I be fine with the 500w or should I go for the 600w?

Thanks guys.

Also will this machine be able to run Halo for pc at full settings? (That was a serious question by the way, halo doesn't run so good on my notebook.)

Thanks in advance.

 

[OzyOly]

Ok. 600W PSU it is.

Also I heard the seasonic PSU's are supposed to be very quiet. Is this true? I don't want to go for a £100 PSU if it's going to be as noisey as an xbox 360.

 

[OzyOly]

Indeed, they are very quiet. But it's not modular, which is the only fallback. And people say the cable lengths are short for a full tower case.

I have a full tower case. Hmmmm.

Do you sujest any particular high end psu that is very quiet then other than the seasonic.