The ASA's been around decades longer than Autism Speaks, the idea of people thinking Autism Speaks (which is very new) came before everything else is a little alarming.
Personally I prefer AutCom (http://www.autcom.org/) which split off from the ASA when the ASA refused to take a stand against aversives. AutCom has its own problems, but it tends to allow more autistic people into the leadership than ASA does. On the other hand, autistic people are really fighting their way into the ASA leadership more and more over time, although it's still mostly the ones most likely to go along with things who get elected to the high positions. Be aware that ASA might still have the policy of not advocating against any procedure that is considered to be an 'autism treatment', even if it's incredibly harmful or nonsensical. For years and years they let the Judge Rotenberg Center exhibit in their exhibit hall thing no matter how many autistic people and/or parents protested. They might have finally stopped, I don't know. But look all this stuff up before you decide.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams