The most recent Millennium Falcon set is like $800 and has over 5,000 pieces. (!) Fun fact: On the Adam Savage 'Tested' YouTube channel they built one of the Falcon sets a few years ago, and the guy on the crew who provided the kit went to my high school.That said, I really would love to build the Saturn V and Millennium Falcon sets.
I'd like the Saturn V, but GD that thing is almost 200 bucks.
Last year, Mrs Tif and I went to the LA Auto show, and there was a 1:1 scale Bugatti (I forget if it was a Veyron or Chiron) made out of LEGO. We had an fun discussion as to which is the bigger flex, having an actual Bugatti or the LEGO one.