Verrrrrrry difficult - an awful lot of them look plausible, but I think for the most part that's because they relate to similar-looking words. Having said which, that knocks out most of my favourites.

That leaves me with 2 as the only sensible option; but I don't feel sensible, so I'll go for 4 or 6 [tosses coin]
*** 6 it is!

Well played folks - another goodie.