Very Good call.
The advantages of SATA drives are (1) Cables - Better air flow Big Advantage, and (2) Better performanance for simutaneous (two optical drives) operation.
For a single Optical drive there is NO performance advantage 16X-20X is 16 to 20X ifor SATA, or PATA.
I have two sata ODDs, but my system only has 1 IDE channel, I use that for a removable.
I believe your system has 4 Sata chanels on the Nvidia southbridge, and 2 Sata ports on the Silicon Image 3132 Chip set.
I would tend to go with the SATA ODD for the cabling, with ONE Big CAVAT- pick a drive, then read reviews (at new egg), also go to club.cdfreaks and check that drive against your motherboard.
I've read problems with Nvidia / SiImage (also jmicron) drivers. Small percentage, But enought to recommend further verification on compatability.