Mark - The prices break down as follows..
ST8300 - $2900
FLI CFW 2-7 + AD2 adapter + customs duties = $1630
Custom made adapter from CFW 2-7 to T thread ~ correct length for optimal spacing between the sensor and flattener = $200 with shipping
Baader MPCC = $250 odd (from memory)
Lumicon OAG = $375
QHY5 - $350 (from memory)
Astrodon LRGB Filters (second hand off the forums for a STEAL) = $375
Astodon 5nm NB filter set + shipping/customs duties $1750
Total = $7830 AU... Wow.. scarier than I thought... Must call the insurance company tomorrow
Of course, if you went for the colour ST8300, the price difference would be amazing... $4057 if you went for the colour sensor as you wouldnt need the CFW or filters, probably less because you could use an off the shelf T-thread extension tube to get the correct spacing for the camera -> flattener. I could have made the whole setup ALOT cheaper myself, as I could have gone for something like the Orion 5 position 2" CFW for $650AU, and Baader 2" mounted Ha SII OIII filters for $700ish... I figured however if im going to buy a mono CCD im either going to go all the way, or not going to bother... I'm happy I went the way I did..