Need new power supply?

[pjmoses]

Hi Guys and Gals, I am putting together a new mobo and cpu in my old Gateway GM-6588E case and am going to put a ASUS M4A88TD-V EVO/USB3 mobo in it using all 16 Gb of ram and a Phenom II X 4 955 in it with a new cooling system.  Do I need to update the power supply to at least 500 watts?  Do the cables come with it or can I use the ones off the old power supply.  I plan on trying overclocking and know it takes more wattage, so what kind of power supply under $50 can I get for an AMD build?  I have 4 HD working on the one I have now that is 300 watts and IDE connection with 4 pin power on one HD.  Can I keep all my drives and wiring harnes?  Just want to make sure when I upgrade I do not have cable issues.

[reddevilggg]

Have you researched PSUs

For example
http://www.ebuyer.com/product/135514

It tells you what cables come with it!

[Geek-9pm]

In the USA and many areas a 700 watt supply goes for about $65 and is a good investment. 
It will give you peace of mind.

[Computer_Commando]

http://educations.newegg.com/tool/psucalc/index.html