I've got a 125 with very similar setup to yours in regards to fish and equipment, only major difference is that I have a volitan, and a different refuge/sump.
But anyway, heres another vote for the snowflake eel. I got him at like 6" or so for 40.00 (or so), and hes now pushing around 10" long, bout as big around as a sharpie pen. He isnt aggressive to my fish, very easy to feed, fun to watch, and quite easy to take care of. Most often he is found buried in the sand or hiding in the LR...Hell I forget hes in there till I see him swimming back and forth at feeding time.