Transfering Power Supply

[SAAER45]

I was looking into this case, because I hate my dell case...
http://www.geeks.com/details.asp?invtid=KG-318-RED&cat=CAS

It says no power supply, but I was wondering. Can I just take the power supply out of the Dell and put it in the new case with the rest of the guts, or do I have to buy a new one?

 

[Yasu]

You can take the one out of your Dell and put into the new case if it's an ATX PSU which it should be.