VMware supports ESXi 5.x installation to SD Cards. They just need to meet same requirements for ESXi as SATA/SAS drives. See VMware KB: Installing ESXi 5.x on a supported USB flash drive or SD flash card so I'm not sure what corruption issue they feel is at risk.
Check the BIOS on your existing box however, ensure power management is set to Maximum Performance. I've read some people experienced better performance on their ESXi installations on Dell hardware with mirrored SD cards after making that change.