Looking for fast CD-Rom to Rip 128aac itunes



I am in the process of converting several thousand CD’s to 128aac.
I currently own two computers:

  1. P4 Zeon 2.4 ghz, 400mhz FSB, 512MB RAM, Lite-On SOHW-1633S DVD
    (Rips 128aac around 8x to 9x with Error Correction on)

  2. P4 3ghz, 800Mhz FSB, 512MB Ram, HP 640b DVD & Asus e616p3h DVD
    (Rips 128aac around 2x to 4x with Error Correction on)

My work machine is a MAC G5 Dual 2ghz and will rip 128aac at 20+ times.

Is there an inexpensive CD-Rom drive out there that will get in the 20x ballpark accurately for my PC’s?
Thank you very much.