ok so u r getting a 150gal tank, cool. Puffers and lions aren't really compatible but there are some puffers that can work. There are lots of eels that can work to same with groupers! Check this list out and see what you think:
EEL: Choose from alot of speicies, what eel you looking for?
LION: you could get a volitan,dwarf,radiata, or antennata
PUFFERS: i had a striped puffer in with my lion and they did very good, so a dogface puffer or toby puffer is your best bet, i wouldn't reccomend a porcupine.
GROUPER: i would choose the miniatus(sp?) grouper very colorful.
Tell me what you are planning on adding to the tank and i will definitly help you out!