BlackBerry Device Software 4.2.0 Up to 2 GB
BlackBerry Device Software 4.2.1 Up to 4 GB
BlackBerry Device Software 4.2.2 Up to 4 GB
BlackBerry Device Software 4.3.0 Up to 8 GB
BlackBerry Device Software 4.5.0 Up to 8 GB
BlackBerry Device Software 4.5.0.81 and later Up to 16 GB
BlackBerry Device Software 4.6.0 and later Up to 32 GB
Taken from the How to Tips Forum. Hope this helps you.
RadioShack sells Boost and also have the best prices on Micro SDHC for Blackberry.
Posted from my CrackBerry at wapforums.crackberry.com