[Auswallaby]

Had a bit of a read from a plethora of other forums and came to the conclusion that I wanted the 6060. From the Mal wood page "This transmission is the latest offering from Tremec, and is found in all new vehicles from 2008. This transmission features improved synchronisers, shifter mechanism, larger gears and a stronger 1 piece cluster. This transmission also features a higher Torque rating over earlier T56 Transmisisons."
Further..."Tremec TR-6060 - 6 Speed

The TR-6060 is the latest and greatest in TREMEC's high-performance O.E. transmission family; designed to help O.E.M. customers more effectively make use of their extreme power and torque offerings. A nearly complete departure from the original T56 it was designed to replace, the TR-6060 represents a vast improvement over the T56 in nearly every conceivable way.

Featuring all new compact synchronisers, TREMEC engineers created additional space to stuff substantially wider gears, thus increasing torque capacity while at the same time creating shorter throws and a better shift feel! While the packaging itself appears virtually unchanged; not a single component, from the forks to the split washers to the main case itself, went without an improvement.

TR-6060 Overview
The "next-generation" TREMEC 6 speed, introduced in 2007
Combines proven T56 architecture with all new components and advanced manufacturing methods
Up to 600lb-ft. of torque capacity
Application specific shifter, speedometer, and mounting provisions (varying by OE model)
The basis for TREMEC's T56 Magnum aftermarket performance transmission"

The ratios were pretty good for what I want as a daily driver. Also noted that there is speculation that the freeway speeds in NSW were going to increase to 130kph, so a much better cruising rpm.