We got crazy lucky on the timing of our build. Any later, and we'd have missed getting the full *First home builders grant.* 
Any earlier, and we'd have been on the hook for stamp duty. So sheer blind luck made a $30K difference to the bottom line. 
I dumped my HUNT for US$2.5K a week ago, now it's worth $US10K. 
Unless you have a crystal ball you're ignoring, you've gotta forgive yourself.