The trac-link rips floors apart! Sorry I didn't see this earlier, but I have run the MM coilovers (front and rear) in the past, and all I can say is that you get what you pay for. I believe most of the price difference is in the parts that sit on top of the spring; they go to a lot of effort to maintain as much travel as possible. I also ran their panhard along with an EVM tri-link so I could stay in SM. If it weren't for that rule I would be running an MM TA, I really don't like how the EVM unit attaches to the floor, although it serves it's purpose by keeping the car legal in SM and is WORLDS better than the global west piece. As much as I hate steeda, the 5 link is a pretty damn good setup as well, and way easy to install too. Pretty pricey though. Another friend of mine who hillclimbs a mustang in SM runs it and we really like the setup, actually like it more for autocross than my tri-link. With a 325lb rear spring rate, they are probably going to recommend 425lb fronts, but you are getting to the limit with what those bils can handle at that point.
Edit: Just saw you are going to run Koni SA's. Probably fine at 425's. Maximum usually recommends ~100lb. softer rear than front, although after running 475 fronts, 375 rears, I would've gone down to 300 in the rear, but I was running a 3 link, so you will probably want to listen to them. TA generally requires a bit more spring.
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