This build looks pretty solid, good job.
The only problem I'm having is that I can not set the GPU engine clock on my Sapphire Dual-X cards when using Catalyst 14.6
With the Vapor-X cards it works fine.
It's probably an issue with the new beta drivers but just wanted to mention it in case it's something in SGminer.

EDIT: Just tested with afterburner and that can change the clocks on the Dual-X cards under 14.6 so maybe not a driver issue ?