Well Landraider, go and price some genuine factory Tojo or Nissan gearsets.
The Mitsi gearsets are on the lower end of the scale.
Tojo & Nissan factory gearsets run around the $900 Oz mark each at dealers over here. I get a good price as I've bought numerous sets off the importer - I get them basically for trade price which is only about 10% lower than what Mitsi would sell them for (not a big margin in these).
Sure there are aftermarket Precision gears etc but it has been demonstartaed time & time again that they are inferior.
The aftermarket fronts are ok as they are barely used but the rears have worn out as early as 20K's with 40-60K's being considered good. Over here most Tojo/Nissan people go genuine rear (if the ratio is available from the factory) and aftermarket front.
And in any event no-one makes aftermrket Mitsi gears anyway so we are stuck with the factory ratio's/sets.
If you really want them it's the only option you have - buy new or source from a wrecker. The 5.29's have all but dried up from wrecking yards over here and are only available new (ex Japan).
If everyone had your attitude ARB would be out of business.............