IMO, the used S8 will best fit your wants and needs. It's professional looking,
large and comfy. But it's also powerful and fun to drive. They're also fairly
uncommon, unlike the S-Class Mercedes and 7 series BMWs. BMW's 740i has always
been great to drive though. After the S8, I'd say go for a used or leftover A6
2.7T S-Line. 0-60 in well under 6 seconds, plus Quattro in a nice medium-large
sedan. The new version's 3.2 simply won't be as good as far as I'm concerned.