In terms of blasting, although this guy works from the gold coast so nowhere near you, it gives you a bit of a breakdown on prices.
http://www.preptech.com.au/prices.html
Respray - $3K to $20K (depends on quality of vehicle, rust repair requried (including if its done properly or not), current panel damage, materials chosen (varies considerably with quality), as well as many other variables). It is a very hard question to answer "how much will it cost to paint my car?" especially before its blasted and its not in front of you to have a thorough look over.
Best of luck, hopefully it goes well.
Al