Advise required for new deck...

Firstly would like to say thanks to people on this forum. Have gained quite an insight into all things deck-building.
About to purchase all timber for my deck this weekend. Thought I’d list it here and ask peoples advise Re: Pricing. Basic layout of deck is 7.6x6m, framed with 140mm Merbau, 90mm for the rest. 70mm Merbau is to cover sub floor (As joists are being bolted to concrete slab). Centre piece will allow me to have no butt-joins (As span is only ~3.6m). Rough sketch below.

http://i188.photobucket.com/albums/z...lings/deck.jpg

90x19mm KD Merbau, all 3.9m lengths, 582.9m @ $3.75/m
70x19mm KD Merbau, all 3.6 lengths, 21.6m @ $3.00/m
140x19mm KD Merbau, 35m @ $6.75/m
90x45mm KD TP, 6m lengths, 138m @ $5.75/m
90x90mm KD finger joined Merbau post, 2.7m @ $28.50/m
140x40mm KD Merbau handrail, 6.6m @ $26.78/m

Will be using 10g Macsim 50mm SS screws, currently looking around for prices.

Any advise would be appreciated.
Cheers