I would vote in the following order:
1: Glasgow "original version": for I like it's clean design!
2: Gan-ruu! for I totally fell in love with it's design when they showed how the hatch open during the wedding! But why isn't it on the list!!!!!
3: Siegfried aka "Flying Orange": because both it and it's pilot are awesome and it isn't an humongous mecha!!!
4: Sutherland Sieg: same as it's predecessor, and it has a heavy railgun and missile launchers!!!
5: Gawain: coolness factor + pilots
6: Shinrikou: same
7: Zangetsu! because of the Rocket Sword!
8: SEITEN: I like how it's energy wings fold.
I'll take my time to vote, as my 1 is lost in a wide batch (why mix it with Akatsuki?? and where are the Gekkas, Knightpolice and Panzer Hummel?), and my 2 isn't even mentionned
Edit: seems I'm the only one who cast a vote for "Others", Gan-ruu where are youuuuuu!