NSW 2008 will be number 3 for me, WA 2006 and Tassie 2007.
Don't spend you money on the sleep easy option, being part of the bustle of the general campsite is half the fun.
Tenting solo is the way to go and it's a piece of cake with the cheap dome tents. Get a three man size, they don't weigh much more than a two man and you'll apprieciate the extra room once you start throwing your gear in there each night.
Remember the tent and gear all need to go into your 20kg limit bag. I found a partitioned bag (one with a top and a bottom section) great for separating tent gear from clothes, especially when it's raining.
MTB problem I get on MTB I fall off MTB No problem