Hi defkin,
I'm in Sydney and I'm getting 625 klondike boards done myself.
I have been waiting for a finalised design to go shopping around for an assembler but these guys look pretty cheap: http://www.tracktronics.com.au.
Dunno if it would work for us to buy together cos I'm looking to have the assembly done within 24-48 hours of receiving chips.
I think we could definitely work together on the heatsinks if you were interested.
Might be good to trade infos on different suppliers/assemblers though.
cheers