How powerful PSU do I need?

Hi,
I'm about to upgrade my old P4 1.4 Wilamette (i850 board, 512MB RDRAM) to P4 2.8 Northwood (i865-based board, 512 MB DDRAM), and I wonder if my 300W PSU will handle my new system. Other stuff it needs to power:
- 80GB 7200rpm HDD
- Radeon 9500Pro (I don't plan to upgrade in near future)
- DVD drive
- CD-RW drive
- BT878-based TV tuner card
- SB Audigy Player
Any suggestions hom much Watts I need? Will 300W do? 350W? 550W ? :) BTW I'm not going to overclock...
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More about powerful need
  1. Go <A HREF="http://www.jscustompcs.com/power_supply/" target="_new">here</A> and it will give you a good idea of your minimum wattage requirements.

    For a safety margain, add another 20-25% to the number when you actually buy.

    Spec:
    Intel P4 2.4B
    MSI 645E Max-U Mobo
    1GB DDR333
    R9600XT 128MB
    SB Live 5.1
    WD 60GB
    Maxtor 120GB
    LG DVD+-R/RW
    WIN2K PRO SP4
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