Not being flight-deck qualified I can't comment from a pilot's point of view, but the freeware panel for FS98 by Eric Ernst (an American Eagle S340 pilot) provides the most functionality in terms of realistic procedures for pre-flight, engine-start etc. of any 757/767 panel I've seen.
The file is difficult to track down though having disappeared from most sites since he started work on a commercial project "767-Pilot in Command" - I don't generally buy commercial packages since I think freeware ones are better so someone else will have to give details on what this is like!
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You start off with an empty bag of experience and a full bag of luck. The trick is to fill the bag of experience before you empty the bag of luck.