Srrrzzzlly, the best version was on Kongregate, and the site of the guy who ported the full Flash version of it. Had almost all the features and it was FREE.
But since Flash is sort of dead, your best bet is to just buy the original PC game from the dev's site.
However I haven't tried the plugin that Kong is now using for Flash, so maybe the best version is still playable on Kong(or the port's dev's flash site).