Welcome Tonner,
As far as transmission choice goes, it depends on how you will use the car. Do you plan to spend a lot of time flying across the open spaces Down Under, or will you be racing on a tight road course?
I just put in a 6-speed from Keisler that is rated at 650 ft-lbs, and I love it. It was pricey though, at around $5,000 USD. When I spoke with them, they were very willing to dicsuss rear end gear ratio, transmission strength requirements, installation tips, and even electronic speedometer wiring.
There are a number of companies building these high strength units. I don't know about the other companies, but Keisler needs some time to put it together. You may want to order ahead of time if you plan to ship it yourself.
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