1). They SHOULD be the same size. Else the array will only be 2x the smallest drive.
2.) The array speeds will only be 2x the slowest drive (theoretically).
Is there anything wrong with buying one from amazon.com I know buying them from amazon has no warranty I am having a hard time chocking up 120 bucks for a 30 GB ssd. Should I be worried about a warrenty on a ssd?