I agree about both the Iman and Amanda dresses. They caught my eye and I can imagine Kate in them as well.
Also, from the Costura Collection - Amaral #7 and Amatista #17
Then, from the Style Collection -
Style 2011 Bridal Collection: wedding gowns and accessories - Pronovias
Festin #7 (probably too form-fitting but it strikes me as suited for Kate), Sagrera #11
If she went in an ultra-modern direction, I lean towards Almina #36 from the Glamour Collection -
Glamour 2011 Bridal Collection: wedding gowns and accessories - Pronovias
Another I could really see Kate in is Almagro #23 from the Fashion Collection -
Fashion 2011 Bridal Collection: wedding gowns and accessories - Pronovias
I also looked through the 2010 collections... Some really interesting directions there as well.
From Pronovias 2010 Collection -
Pronovias 2010 Bridal Collection: wedding gowns and accessories - Pronovias - Habana #5, Mindanao #6, Milan #13, Maldivas #18, Magda #52, Mireia #57, Goleta #79, and Gaviota #83
Manuel Mota 2010 Collection -
Manuel Mota 2010 bridal collection - Wedding gowns for Pronovias - Tamara #1, Chamira #3, Toledo #4, Okapi #42, or Toscana #47
Valentino Sposa 2010 Collection -
Valentino Sposa 2010 wedding dresses collection - Bridal gowns for Pronovias - Metis #4 or Griselda #9
Whew... This is why I was telling myself to not go looking at wedding dress websites tonight or any other night this week. I can get lost and waste entirely too much time that should be spent on the sewing projects of my own that need attention, lol.