What PSU do I need?

I blew up by 250w Enlight PSU a few months ago and got a 350 Powertec. My current hardware setup is:

Athlon 1700+ at 1.6Ghz currently ;)
Floppy drive
CD-ROM
CD-RW
3 Case fans
GF2MX400 to be GF4TI
10/100 NIC
Firewire card
SB Live value
4 WD HDDs

The +5 on my mobo is about 4.87. Is my current PS powerful enough? Will a 400W Antec help my Overclocking situation? What would be the best PS to get?

Antec PP412X is what you need, and yes it will help with your OC situation because you can adjust the 5v rail. Simple, Good Luck ;)