If you are building a new rig I would think you'd have plenty of SATA ports available to you and newer mobo's typically only have one IDE(PATA)....that, to me, would make it a no brainer. On top of that SATA is the "now" interface while IDE was the "yesterday" interface. I really see IDE being phased out completely in the future, but who am I?
Now just get you a nice beefy modular PSU with plenty of plugins to power all those new SATA ODD's and HDD's you'll be plugging in and you'll be in business.
Corsair HX620