Double and bash and chain device setup for mmmbop

Well the title pretty much says it all 
I'm running a truvativ stylo crankset with x9 mech up front on my mmmbop and looking to go double and bash with chain device...
Any recommendations? I saw the e-thirteen DRS but is a little pricey!
Thanks!!!

I'm running a truvativ stylo crankset with x9 mech up front on my mmmbop and looking to go double and bash with chain device...
Any recommendations? I saw the e-thirteen DRS but is a little pricey!
Thanks!!!
Boardman Road Pro 2010
Viper Carbon Lite 2008 Custom Build
Viper Carbon Lite 2008 Custom Build
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Simon