This is a great thread indeed.....but i have to say that sometimes enough is enough with these mega yachts.
After having been around boats my whole life, id say the biggest id EVER go (if money was no object) would be somewhere around 85 feet.
Something like a Sunseeker, Perishing (posted above), or Lazzara would be great...as would a nice Hatteras or Viking Motor Yacht.
With that said...keep the pics coming!!!