Have you ever flown First Class?

[brooklynite]

70. I've flown Business Class, First Class & Concorde...

...and the quality always depends on the destination (Domestic vs International), the airline (Domestic vs Foreign) and the duration of the flight. Five hours to the west coast isn't worth it, but neither is a flight where you end up sleeping all of the way and go get the meal/comfort experience (a Westbound flight from Europe to the US is better than the reverse).

Truly top of the line would be Emirates or Singapore Airlines. British Airways and Air France have both old school FC and cheaper but still enjoyable Business Class. Almost any Asian airliner would be good in FC, and almost any European Airline (possibly excluding KLM) will have a good Business Class product.

For some descriptions, let me suggest you visit FlyerTalk.com or Airliners.net.