Avast has a 64bit AV it has been available since version 4.5 you can get it at the link below. And if you would have read my post more clearly you would have noticed that i said you do not have to have them all running at the same time.
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And you do not have to have all of them running in the background but you should do regular scans with them all
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http://www.avast.com/eng/whats_new_in_avast_v.html