Recently I was given an Ibanez RG170. It was filthy and nasty looking, but now I've got it all cleaned up and ready for new strings.

I'd like to use this guitar for lower tunings (stuff like Fear Factory), so I'm looking to put heavier strings on it.

Any tips for string guage, set up, etc., for this particular guitar?
D'Addario makes a 12-60 set, that would be good for tuning down to B std like a 7 string but without the highest string.
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12-60's would be good. I'm not sure what the build quality on the Ibanez is, so I'd be extra cautious and make sure that you don't horribly warp the neck or anything by setting it up for such a chunky gauge incorrectly.