I haven't done one of these since last year. So here are a few new mechs for you to ponder.
Gorilla Mechanoid Mk.II by Captain Moebius. Pretty beefy. A good way to start this line-up.
Battle Frame UB-30 "Brawny" by Djordje. Maybe a little big for MFZ, it has some clean Battletech-y lines and some neat techniques.
LIRA by SageThe13th. Freaky looking -- in a good way. Maybe a little small.
Terranax Liberators Model R2 by Captain Foo. A render. Great use of color in this one.
High Speed Combat Mech by SmellSterns. This one looks a little on the large size for MFZ. But if you chop the legs down a bit he should fit. I see some Zizy influence here.