It depends on how much you rode those other bikes. The 6-month gap itself isn't that big a deal; once you have developed the proper skills, it's not too hard to get them back again. But if the rides you describe were limited in scope, then you haven't developed those skills in the first place. If you have a few thousand miles on those bikes, then go ahead. If it's more like a few hundred, I'd say you're still a new rider and should get a new-rider sort of bike, like an EX250, EX300, EX500, CBR250, or GS500.
1993 Ducati M900 Monster "Patina" (228,000 miles, so far) -- 1995 Ducati M900 (wife's bike) -- 1972 Honda CB450 (daughter's bike) -- 1979 Vespa P200 (daughter's scoot) -- 1967 Alfa Romeo GT Jr. (1300cc) -- 1964 Vespa GS160 (160cc 2-stroke) -- 1962 Maicoletta scooter (275cc 2-stroke) -- 1960 Heinkel Tourist 103A1 scooter "Elroy" (175cc 4-stroke)