Not to be a jerk - but why the 'builds' forum?
Anyhow, when you refer to 'stage III', it isn't really a closed issue as it's been said. Some people refer to it as a turbo swap, some just an intercooler, down pipe, and tune. Regardless, you may not be 'running with' the m3's even with a jet engine on the back of your car. There are many things that go into lowering track times - some way more drastically than some added power. For example: good tires, better brake pads, some better springs or sway bars, and most importantly - experience. If you are just talking about the drag strip exclusively - save the cash and put it away in prep for a new transmission/axles/clutch/whatever fails first. A running car always beats a paperweight =).
Just some food for thought.