Hmmmm... I came across a list by the Yacht Council of the 5 most expensive yachts. I don't know how accurate it is, but here are the stats...
1. 244' 1991 Katana (Blohm & Voss) $68 million
2. 194' 2001 Pegasus (Oceanco) $56.9 million
3. 196' 2003 no-name (Oceanco) $53.6 million
4. 247' 1973 Big Red (IHC-ex-icebreaker) 45.3 million
5. 178' 2004 Sailing Yacht (Alloy) $35.5 million
Don't quote me on the names, as I'm recalling from memory. Of all the things I miss the most... it's my mind.