I need to get a new HD for my Dell Dimension 8250....don't ask why I have that PC.....

Anyway, this is what I gathered so far if I want to go SATA

SATA HD
Power adapter?? not sure...
SATA controller

I currently have a 7200 RPM IDE HD.....

Sorry if I sound like a n00b....I've been in desktop setup for so long that I've neglected to keep up with hardware/specs and requirements.