I just bought a Kate Spade. I like it because it is nylon on the inside and wipe clean on the outside. A lot of the nice designer ones aren't practical because you know you are going to get them dirty.
I recently bought a couple Hadaki bags that I found on ebags (the "coated travel essentials kit" and the "toiletry pod"). Zappos has a lot of options too. I'd also suggest MZ Wallace, Kate Spade and Marc by Marc Jacobs.