I've got too many to name but I love Carolina Herrera for her sophisticated elegance, Zac Posen for his innovative style, and Narciso Rodriguez for his streamlined simplicity.
Sass and Bide - because their clothes are truly original and tend not to follow trends at all, plus they are very wearable.
Alberta Ferretti - because her clothes are feminine but not little-girly and her dresses are beautiful.
Stella McCartney - I just love her designs and don't think she only got into the business because of her dad. Well, maybe she got her foot in the door that way, but she is actually talented. I love her tailoring, the fact that her clothes are made for female bodies and the originality of her pieces.
Chanel - duh.
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"Don't be cool. Cool is conservative fear dressed in black. Don't limit yourself in this way." - Bruce Mau