We just went through this decision process ourselves. As a result, assembling this will be my weekend project.
Traditionally I'd get a cheaper BBQ from The Warehouse or Mitre 10. But they never seem to last more than a couple of years. My last one was bought two Christmases ago, and one of the burners has split. So, being sick of this false economy, I decided to spend a bit more.
Initially I was a little concerned about the size of the Weber. But reflecting on our actual usage patterns, I think it'll be plenty big enough.
They do like to sting you with the accessories though! We use our current BBQ for rotisseries a lot, so we wanted the Weber to do that too. And this was a $300 upgrade!
I'd also back up the advice of going to an official Weber specialist dealer stocking the whole range, rather than Mitre 10. For us, this meant seeing the Weber in Mitre 10 Northwest, scratching our heads as to why there was no temperature gauge, and then walking 50 metres to Palmers Planet next door, where they had the full range. The difference was that Mitre 10 was only selling the Weber Q 3100, whereas the model we got was the superior 3200.
Fellow Webber Q owners, what do you use to clean it? Do you stump up for the $20 "official" Weber cleaner, or is there something far more cost effective that can be used?