Just a correction on the section of that post that I highlighted - the "EF-S" in a Canon lens description does not stand for "Stability," it stands for the fact that those lenses will ONLY fit cameras with the smaller APS-C sensor (i.e. 450D, 500D, 550D, 50D, 7D). If a lens is tagged as an "EF" lens, then it will fit cameras with either the APS-C or full-framed sensors (i.e. 1D MkIV, 1Ds MkIII, 5D MkII).
If you've decided what you want, do an advanced search on Static Ice for the best pricing in your area, or check out Digital Camera Warehouse who have stores in Melbourne, Sydney and Brisbane. If you don't mind buying from o/seas try B&H Photo Video in the US or DigitalRev in Hong Kong. I've bought from all 3 shops and the delivery dates were quick!
Check this out too: http://www.digitalrev.com/en/5-reasons-the...88-article.html