Number Cruncher.....
I am also hour building at the moment and as part of it, I'm in the process of completing my IMC training in a PA28 Warrior and thouroughly enjoying it!!!
I decided against doing the IMC rating on the Arrow purely for cost reasons and also considering the fact that it would increase the workload, as FlyingForFun also commented on.
I do still want to be checked out on the complex type before doing the CPL, just to get some experience on type.
Good luck with your flying!!