I like the idea of a top swap because if I ever do go the L67 route I would have a freshly serviced M90 to slap on the L67 plus all the other little bits and pieces that would have been refreshed.
I appreciate the feedback. I want to avoid replacing the cam right away. I don't need an 11 second car or nothing, I just want something with a bit more oomph while merging and moving around traffic. I frequently find myself following somebody 10-20 below the speed limit and do not feel comfortable jamming the accelerator to get around that traffic because of other vehicles.
Safety is a big concern as well. My Civic is pretty small compared to a lot of the vehicles on the road and having a slightly bigger vehicle would make me feel more comfortable.