Hmm... I've had a set of Enkei RP-F1s, a set of Kosei K-1s, and a set of Rota Circuit 8s on my Miata. Of the three, I would have to say that the RP-F1s had the best finish, although I've never had a structural problem with any of them.
All three of the brands you've mentioned make good quality wheels. The Konigs might not hold up aesthetically as well as the Enkeis over the long term, but that's not to say that the Konigs will fall apart - just that they may be more susceptible to minor cosmetic blemishes.