I jumped from Cyanogen 5.0.6.2 to BB v1.0 and will probably be going back to Cyanogen later today. BB has been ok, definitely not the speed king that everyone is making it out to be. I'm a little suspect of the "in house" memory management tools, as my phone has progressively been getting slower and slower over the last day. Apparently there is a file within root explorer you can delete that gets rid of Pete's mem mgr. Just my two cents.
I would stick with what you have unless you just like to tinker around with different roms like I do
