*chuckles* Ahh dear, I know what you mean! I don't really like embracing a part of me that is named after some random guy who is long dead, and it's not a pretty sounding name! Aspergers just sounds yucky, but like you I find Autism a much pleasanter sound. Plus it sounds like a rainbow! Technically Asperger's is on the Autism Spectrums so you can say you have Autism: it's like the difference between saying 'I'm an artist' (Autism) and 'I do water-colour paintings' (Aspergers): one's just a tad more specific, but it's the same family. If you don't like the drop bags and stare effect that Autism can have (although I think if you can handle it then it's good fun to get people to stop and think before going along with the Rainman stereotype whenever they hear the word!), then you could use AS, ASD, Autism Spectrum Disorder/Condition, PDD (Pervasive Developmental Delay - close enough match!), or if it pleases you, 'Aspie' or 'Autie' (these are affectionate terms usually used within the community; they make some of us wanna puke, but I like them!).
Alternatively you could just look people in the eye and say 'excuse me, do I LOOK normal to you?'!
Welcome to WrongPlanet by the way: glad you are enjoying your stay! 
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...though fire may burn & flames envelop me, I will arise from the ashes...