Live is the way to go if you are doing a recording... Just find a good acoustic guitarist in the area, maybe swap out a little playing time (you play some keyboards for free on HIS stuff), and if you haven't recorded a guitar before, listen to his recommendations for how to get a good sound...
Some of the Yamaha styles have pretty good strumming patterns and picking patterns, but real is always better!
If, for some reason you CAN'T find a tight enough picker, try listening to ALL the styles, and if you find a strumming pattern that works for your song,, either record it separately (it's tempo will still be tight, so you can 'slip' it into sync with your other tracks) or assemble a Frankenstyle (Ian can help you with this) where it is the main guitar part.
Hope this helps...
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An arranger is just a tool. What matters is what you build with it..!