are you looking to go with an aggressive tank? do you want many small fishes, or just a few larger species?
I have a 150 with similar dimensions, and if I had to stock it all over again, this is what I'd go with-
- black durgeon or blue throat trigger (relatively calm triggers, may not eat a clean up crew)
- medium sized angel of some sort
- dwarf lion (possible issues with triggers, but probably not with the kinds above)
- hippo or sailfin tang
- maybe a smaller hawkfish
- maybe an eel (snowflake or zebra)
my actual stock list is relatively similar, and there's always something going on in just about every part of the tank.