As far as a gentleman's folder is concerned I second (or is it third by now) the recommendation for a Mcusta.
Some others to consider are:
Case, Queen, GEC (or any of their spin-offs) slipjoint. Many options of style, blade steel and handle material
Kershaw Nakamura. It is discontinued, but one pops up on the evil-bay every once in a while
Kershaw Splinter. It is discontinued too, but easier to track down
Benchmade Shoki
Spyderco Kiwi or Kopa
Theirs Coutellerie Chambriard
And that Boker Elegance sure looks good and is affordable to boot.
Good luck on the search
Veil