The specifications :
Dual 867MHz PowerPC G4
256K L2 cache
& 1MB L3 cache/processor
133MHz System Bus
256MB PC2100 DDR SDRAM
60GB Ultra ATA drive
Combo drive (DVD/CD-RW)
NVIDIA GeForce4 MX
56K internal modem
$1,699.00
Dual 1GHz PowerPC G4
256K L2 cache
& 1MB L3 cache/processor
167MHz System Bus
256MB PC2700 DDR SDRAM
80GB Ultra ATA drive
SuperDrive (DVD-R/CD-RW)
ATI Radeon 9000 Pro
56K internal modem
$2,499.00
Dual 1.25GHz PowerPC G4
256K L2 cache
& 2MB L3 cache/processor
167MHz System Bus
512MB PC2700 DDR SDRAM
120GB Ultra ATA drive
SuperDrive (DVD-R/CD-RW)
ATI Radeon 9000 Pro
56K internal modem
$3,299.00
More info here and you can order it at Apple Store ...