That's why I've been partial to Sram, that and the shifting efficiency. However, on one bike I run an XT Shadow rear rerailleur and find it as good as the Sram X9 on another bike. I also prefer the Shimano shifter that came with the Shadow (push or pull to upshift vs. push for Sram or pull for standard Shimano shifters).

Have you considered Sram X7 instead of Deore?