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If anyone is interested I've been doing quite well with Galio for the past few months, and nearly have it down to a science. My build is very high AP (700+ late game), but also semi-tanky (using GA). I generally end up with double digit kills and win team battles for my team.
Short version -
magic resist boots
GA (oracle optional)
P.S. Tank Galio sucks, and ThornMail almost never works out well. Note this build requires a solo lane and heavy farming.