I think you mean "Looe Key" about 30 miles north of Key West - good reef, worth a couple of tanks and better diving than much of KW.
Unless you charter a multi day trip which will take you to the Dry Tortugas, I think you will find most KW OP's do the closer in sites, which if if did not like the Middle Keys, you for sure will not like the majority of KW sites.
However, the recently sunk Vandenberg may be a very welcome addition to KW. Diving it Sunday and really looking forward to it.
The better sites are in Key Largo and Islamorada - although there are those who love the middle Keys - I do not, at least for diving.
However - for what is the best diving in FL (IMO) - Palm Beach County - Jupiter, West Palm, and Boynton - have what many locals - and few out of the area - believe are the best reefs and for sure the most large animal encounters.
Post back if you want some PB operators.