Vernis is beautiful and chic, but believe me ~ you would use epi much more often. Epi is like everyday bag while vernis is for special occassions.
Quetche or black ~ depends on what you wear, but you can't go wrong with any of these.
If you need something for dates, evenings or special moments, vernis will be great! Esp. Pomme ~ a real eyecatcher.
Good luck deciding! I will be looking forward to seeing your reveal.