PSU Wattage for my basic rig?

My config:
Mobo-- G31M-ES2L
CPU-- Intel Dual-Core E5300 2.6GHz (Haven't overclocked it)
RAM-- 2 * 1GB DDR2
HDD-- 2units. (320GB High rpm SATA + 40GB regular SATA)

No DVD/CD drives, no 56k modem, no video/audio card.

I calculated on this site, and it recommended me just 234W.

So, do I really need a 450W PSU, or a 250-300W would suffice?


Ps- My 2year-8months old Odyssey 450W SMPS collapsed today. Thankfully my rig is fine.