How do you feel about "scuba" or "laser?" Acronyms that are pronounced like they're spelled (eg, Nasa, gif, taser) tend to end up being spelled like words sooner or later instead of being in all caps.
Personally, I don't write SCUBA or scuba, as it's just not part of my day to day conversation, but I would go with SCUBA. Also, it's never just laser or LASER, it's friggin LASER!!! Pew Pew!