Newbie requiring advice on Dual Battery/Cage Roof Rack purchase and fitting in S

Dear Nissan Patrollers,

Sydney, Australia

We have recently bought a 2003 Nissan Patrol 3.0L Diesel Manual, which we will be taking on a years trip around Australia. We start our trip in October 2010, but still require a dual battery to be fitted (for an Engel Fridge and charging laptops etc), and also a cage roof rack ( we already have fitted 2 Thule Bars on the roof but require a cage also). We have had excellent advice from the ARB Shop at Artarmon, Sydney. I have no doubt the ARB equipment would be first class, but does any one know other 4x4 fitters in Sydney that are competitively priced (i.e. cheaper than ARB), but still provide excellent quality products and fitting in Sydney?

We’re also looking at getting a canvas cover for the roof rack. Does anyone have experience with retailers in Sydney for these?

I thank you for your time and responses.
Kind regards,
Pete