@reds12t, Do you have 4WD? Are you looking for traction off-road when needed, or are you looking for a limited slip for on-road traction? If the former, why not just add and ARB Air locker. They make it for the R230. That way you don't need to step down to the R200 and you get to keep all the stronger components and not change them out.
I've done it on mine and it's works awesome. While I was at it, I installed the 3.36 gearing as well. If you are replacing gears, might as well get the ARB locker for the M205 as well. They make it for that diff as well. Fully locked, on demand.
For on-road traction, the V8 AWD and electronic ABS does an excellent job. The AWD system is derived from the Skyline GTR AWD system, which is one of the best in the industry.