Some of the SATAs, like my WD 120 Gb SATA HD, has both power connectors, the new SATA power connector and the older four fat pin one. I used the old style connection just because the setup diagram for my video card says to connect it to the hard drive's power cable.
By the way, I intend to keep my fairly high end system a looooong time before any next one, so I wouldn't be properly considered a "regular" scratch-builder of computers. (Now, my brother in law is another kind of guy! He had built at least five, if not six or seven systems over the last two years at the longest... I wonder if he will have doorstops for all doors in his house... )
But I might slap together two more, for the kids, as the ones they're using are unmentionably old.
By the way, does anyone have any advice for overriding an onboard graphics chip with an add-on graphics card? In case it's helpful, it's an old HP (P2) Celeron system. I even tried using their step by step instructions from their website... still no go; the system simply refuses to recognize the "new" (GeForce 2 MX 400) card. Everytime it is inserted into the AGP slot, the computer just won't boot. I don't want to build another one to replace this oldie just yet. This new Athlon 64 unit set me back a k-buck.