It looks like a good place to go is Perth Powder Coaters. Tim (Subastylin) will look after you, and he's a good bloke to deal with. If I remember correctly, someone on here got their rims blasted and coated for $280 (set)
Perth Powder coaters
25 Fairbrother St, Belmont WA
94791356
0411 612 530
http://www.perth-wrx.com/vb/showthre...ht=powder+coat
http://www.perth-wrx.com/vb/showthre...ght=powdercoat
I will be getting this done over the next month or so, will post before/after pics and prices.