If you're trying to save money, then make yourself a cheap waterblock, get a heatercore out of a car wreck, but don't skimp by getting a cheap pump.
Eheims are popular because they have gained a reputation for being reliable.
The point folks are trying to make is that you can save money on waterblocks and rads, they won't perform as well (probably) but there is nothing to fail. But if your pump fails, then your cooling fails, and if you don't have thermal protection built in, your processor dies in a matter of seconds, minutes if you're lucky.
Moral of the story, it ain't worth trying to save money on the pump.
Have a look at
OCAU forums for advice. They will be able to better advise you as to what is cheap over in OZ, cos I know from looking round OCAU, that eheims are really expensive over there. However, they will know what is good and reliable, and will fit your budget.
Hope this helps
8-ball