Union- I'd skip them unless you can try you're boots in them first.
Diodes- Seemed to have some highback issues last season so you may have some downtime. Burton does have great service though.
Genesis- Not sure these fit what you're looking for the highback is supposed to be on the softer side.
Now- no clue, but you may want to wait a year on new tech.
DMCC- similar to the Diodes, some highback issues, no canting.
You could also look at the SF45s from Flux and Rome Targas both great durable bindings. The Targas have canting the flux don't. Others include Ride el hefe and salomon chief/caliber.
Personally I was looking for a stiff aggressive binding this season and went with the Raiden Machine. I ended up getting these because they're a little different than what everyone has and the air bag dampening system.