I just want to throw my two cents in here (and hey, howcome nobody's commenting on my party! waaa!

):
I like you party, I like it a lot. The FMT is a very good option if you're not into backstabbing (I'm not). If you use a thief like I do, which is to say they're just about useless except when opening a lock or disarming a trap, you have two choices:
1) The FMT
2) Dual-classing
I like both options. Right now, I'm trying a character that takes 7 levels as a thief (with an 18 dex, he has a 95 FT and a 90 OL -- should be more than enough), has the ability to Evade some attacks, and just switched over to Fighter. You say you've played BGII before? Well, I basically remade Imoen with that character. Good enough Thief, will be a powerful Wizard.