On the photography end, Hoodman has a guarantee no-failure on their cards. You’ll have to read what this guarantee actually covers. I do know a lot of photographers prefer these cards. I haven’t used their product before, but since they are now distributing the MxM adapters, it may be something to look into.
You may also want to consider an external hard disk recorder for a backup for added redundancy. More money I know, but better than giving money back to a client and damaging your professional credibility.
If your not run and gun, you may also try hooking up a laptop and use it as an additional recording media format.
Sony’s SxS has dropped down close to $800 at B&H.
Brent Dunn
DunnRight Video.com