I just love the way Speedy looks in Ebene and Azur. I'd go with Azur! Sure you have an Ebene in Damier but if you get Mono you would have two dark bags. It's almost spring go for a lighter bag!
remember that the leather darkens and when it darkens people seem to not like it with the AZUR line. Personally I like it but something for you to think about b4 your purchase. If you want to use your bag no matter the weather EBENE Damier would be the one and you wont have to worry about the vachetta. If I was in your shoes I'd go with the MONO Speedy.. I'm a sucker for MONO!