MacBook Hard Drive Upgrade = Free PS3 HDD Upgrade & External Drive

I’m thinking about upgrading my MacBook Pro from it’s stock 320 GB hard drive to 500 GB, to make more room for my Windows gaming partition. The pleasant side effect of this upgrade is a free upgrade for my PS3 and a bonus 80GB external drive.
This round of upgrades would cost me around $130 (or less) to buy the 500 GB 2.5” SATA hard drive and a 2.5” SATA external enclosure.
Since the PS3 also uses 2.5” SATA drives; after cloning my Mac’s system onto 500 GB drive (via the external enclosure) I’ll put the Mac’s old 320 GB hard drive into my PS3. As a bonus I’ll make my PS3’s old 80 GB into an external drive with the enclosure.
Note: The only complication will be making a backup of my PS3’s files (because of DRM). I plan to use another external drive formatted to FAT32 to backup my PS3 files before the upgrade. Any other PS3 compatible flash memory will also work.