An open top does limit your selections. No wrasse's or firefish for sure, and most goby's can be a risk.
I had not heard of people having trouble keeping hawkfish alive before. I have done quite a bit of research as I am looking at buying a flame and a longnose. Flames can get more aggressive and both kinds of hawkfish will eat shrimp.
My candy hogfish are out all the time, and while there is a little risk of jumping, they're not as bad as wrasse's from what I have read. They are very colorful as well.
Just a warning about any dwarf angelfish, they can and will eat any coral. I had some for a few years that suddenly decided to start eating some corals.
I'm not sure if you have seen an adult engineer goby, but I love my 3. Kind of an eel replacement without the risk of eating your fish, being an escape artist or getting too big. They will dig in the sand though, so make sure you have a decent amount of sand and that your rocks are right on the glass and not sitting on top of the sand.
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