Probably Chanel, even though I've yet to own one of their bags yet I just love some of their designs! I also really like Dior, and for some reason they seem a lot more "young" than some other brands to me (which works for me).
Obviously, it was Chloe and I hope it will be again, soon.
Bottega Veneta,
Alexander McQueen,
Stella McCartney,
Roberto Cavalli,
Marc Jacobs, Gucci,
Pucci,
Missoni,
Matthew Williamson,
Miu Miu,
Biba,
Balmain,
Derek Lam.
I also loved Tom Ford for YSL and Gucci.
I like different designers for different things and sometimes their collections are stronger than at other times, so it's very hard for me to pick just one.