G'day mate,
You have to consider first exactly what it is you're after. My advice to my tuner was that I did
not under any circumstances want to lose any torque vs the factory cam. This is because I drive the car to work every day, and on 3,000km road trips at least once a year where 6th gear counts. It's not just a track car, although it does see the track at least once a month.
I ended up getting a 228/230 cam, using 1 3/4" tri-y extractors (the scavenging effect helps with torque vs 4-into-1 extractors) OTR and dual 3", and shaving the heads to increase the static comp. Using this combination, the cam's torque curve never dips below the factory curve. End result was 320rwkw, using the factory cats (which are a significant restriction, you'll likely get better figures on high-flow cats.)
This setup I find to be very driveable. Apart from the lumpy exhaust note, which is awesome, the only time I notice the cam is when I dip below about 1250rpm, then the power delivery causes a bit of drivetrain shunt. But who drives at that RPM anyway?
That, or go with what cheesy_j said above. Some 4.11 gears will help to make the gearing shorter, but keep in mind you'll lose even more economy with your engine spinning so quickly all the time - and a cam does increase consumption!