Tank mates.....little help

[Cujo#31]

I have a very large aquarium (500 gallons) that had originally been destined to be reef. Thank god I haven't invested thousands into crazy reef madness because work is taking new direction and no way I would be able to properly maintain reef, family and work.....I'd never get any sleep.
What I currently run is a 120 with an 8" volitan, an 18" bamboo shark and a 30" snowflake. In my 90 I have some LPS, percs, sailfin, hippo,and yellow tang, a coral angel, a melanarus wrasse, a couple gobies and a little bastard yellow tail damsel.
My plan is to divide the aquarium (12' long) into 8 foot and 4 foot. Keep corals and small guys in 4 foot side, and rest of fish in larger side. The question is what other tank mates would make good choices in large side......obviously "fit in the mouth" size ruled out)