I always liked the Omniwrench 10000 the best, it just looks so slick.
I quite liked that design too! In fact, it's probably my favourite design of all the main gour wrenches. Though, that is also one of the reasons that I like the Millennium 12; it bears a strong resemblance to the 10,000, albeit with a slightly duller colour scheme.
I also went back over the trailers and images, and, unless I've missed something, it looks as though they have yet to show the Wrench, but my guess is that it will either be the classic silver design like the 8,000 or the 3,000, or it will be the Millennium 12. Somehow I get the impression they're not going to come up with a new design for the movie, and I doubt they'll use the 10,000 or the 12,000….