While buying a stiffer rear motor mount would help with some of the drivetrain sloppyness, it does not help with shortening shift throws like the TWM or our SSP is designed to do.
If you're looking for shorter shifts without hurting your wallet, a short shift plate is the way to go. We have a...
Only bonus I got when I purchased my Speed3 was a butt-load of insurance and purchase papers from the original owner shoved in back of the glovebox. I called the previous owner and did the right thing by shredding all the documents.
Clutch longevity entirely depends on how you drive the car. I think the MS3 has a pretty solid clutch which stands up well to some abuse. Of course, the more stress you put on the clutch by increasing HP and TQ figures will shorten the life of the clutch. Be nice to it and it will be nice to you!
My 2008.5 MS3 had a clunk when shifting from 1st-2nd and sometimes from 3rd-4th. It's been happening since I bought the car with 10k miles. Consensus seems to be that the sound is typical of the car.