Folded to me in LP with a maniac in the blind

[SlantNGo]

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If he's raising 50%, and will bet every single street regardless of what falls, I don't mind playing all-in mentality poker. I find two starting cards that I like, and get ready to see a showdown (think big cards -- suited connected things don't do well in this situation because you can't get in cheaply and you'll need to show down a made hand to win).

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Aaron, I was thinking much along the same lines, hence why I auto-called these down. The question is though, how low should I open-raise if I know he's gonna 3-bet me 80% of the time? Like I said, I value A-high for showdown value, so I'd probably go down to A6 here, but should I still be open-raising K9? QJ?