Power Supply Deals Power Supply Upgrade?

Power Supply Upgrade? - power supply deals

Gateway 500X RETAIL I, a Intel P4, the current output of 160 watts of values. At newegg.com ia many 600W power supply.
- I Should my 600W gateway?
- Can I ATX12V V2.01 Power Supply?

I'm new PSU becas my video card requires 350W min.
600W power supply, because there the same price of other (after all, savings)

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182032