I have been using the Ameda Purely yours for 6 months (exclusively feeding EBM).
I bought it new off Ebay for $280 and am very happy with it - I have been having some issues lately with the motor - I think it's just starting to show it's age (and use) a bit.

What do you want it for? Are you going to be expressing exclusively or just occasionally, or combining BFing & expressing say for work?
If you are fulltime expressing, the Ameda is great, it's a double pump & designed for heavy use.
If it's occasional expressing then I wouldn't bother with something so expensive & heavy duty - any pump, even a manual one is going to do the job, Avent & Medela are good though.
If it's for work or you're going to be using it a bit, the Avent Isis IQ uno would likely be ok - this is the one that I had bought while PG - I returned it for the Ameda when I ended up EE. I never used it myself but I heard good things about it.

HTH

ETA - if you're on the Gold Coast, Treetops Pharmacy had the Avent IQ uno for $150 which is cheaper than anywhere else I found it...