As of the time of this writing, the standard in quality hard drives is SATA.

The following are all current 5 star rated internal SATA drives from Tiger. They all have 32mb or more disk cache.

500GB for $64.99
Western Digital WD5001AALS Caviar Black Hard Drive - 500GB, 7200 rpm, 32MB, SATA-3G $64.99

750GB for $79.99
Western Digital WD7501AALS Caviar Black Hard Drive - 750GB, SATA-3G, 7200rpm, 32MB $79.99

1000GB for $89.99
Western Digital Caviar Green WD10EADS Hard Drive - 1TB, 32MB, SATA-300, OEM $89.99

1500GB for $109.99
Western Digital WD15EADS Caviar Green Hard Drive 1.5tb $109.99

2000GB for $179.99
Western Digital Caviar Green WD20EADS - 2TB, 32MB Cache, SATA 3 gb/s $179.99

2000 GB for $169.99
Hitachi Deskstar HD32000 IDK/7K Internal Hard Drive - 2TB, 7200RPM, 32MB, SATA-3G $169.99