I really thought to buy the Millennium Falcon but figured it was too big. I have been into Lego Technic for a years. I can't recall my first model but they recycle easily. What I mean by that is that I build and enjoy for weeks/months then disassemble and pack away for another day.
Here's a video of one of the early ones. Interestingly, I got it out of the cupboard a week ago ams plan to reassemble in the next days.
[youtube]mz2o9U93rZE[/youtube]
Being the Technic fan (AFOL) I am planning to buy the monster LEGO Technic 42100 Liebherr R9800 at some $USD 449.99, that's $AUD 749.99