What zanthor ment (i think) is:

Simple + Powerful (but not free) = Keyclone (Here the simple means, it has a gui-based-setup)
Powerful + Free (but nor simple) = HotKeyNet (Here not simple means, you have to actualy write scripts (or let them be written from me )), and maybe AutoHotKey
Powerful + simpler (but not free) = Innerspace (Here simpler means, as you are looking for only windowpositioning, this can be done with IS with the autolayout-function which is quite simple, but also require you to write some scripts (or use zanthors))
Simple + Free (but not so powerfull) = honestly no real idea, what would fall in this category, maybe the original wowmaximizer.