KEY WEST - A disoriented man with slurred speech called Key West police to his seaside hotel early Monday to report that his high quality Bahamian marijuana had been stolen. Jim Devlin, 33, an investment banker from East Meadow, New York, told police that his ''weed'' was missing from his bedside drawer at the Hilton Resort & Marina, adding that his girlfriend's $1,800 watch and a $50 bill were gone too. (...) The investigating officer said Devlin reeked of alcohol, and was asked to sit down because he was swaying badly and speaking incoherently. A report was filed for the missing watch. ''I only want to report the watch, not the money or the weed, because I don't want to tell you how much weed there was,'' Devlin told police.