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@sifriday
My take on it is:
Alfine is designed for the Shimano CN-HG53 9sp chain:
http://bike.shimano.com/media/techdocs/content/cycle/SI/Alfine/FC-S500/SI_1HD0A_En_v1_m56577569830604038.pdf
Sheldon Brown is pretty happy with the idea of a 10sp chain being used on 9sp cranks:
http://sheldonbrown.com/speeds.html#chainrings
and again
http://sheldonbrown.com/speeds.html#chains
Sheldon says there might be shifting problems on the 9sp/10sp mix, which here would be the front, but in a 1x10 setup of course you won't be shifting on the front anyway, so the combo of 10sp cassette, 10sp chain and 9sp crank should be fine...
I picked 1x9 rather than 1x10 for two reasons: a bit cheaper, and compatible with my MTB for cannibalising parts. The resulting gearing of 39x(11-34) has been great, ideal for commuting and light touring. When I run out of top gear, I'm usually doing 20mph+ downhill so am content to freewheel at that point. So a big thumbs-up for 1x9 or 1x10 setups, enjoy your projects :-)
One day I have a bit of an ambition to get this for my MTB, when it is cheaper:
http://www.sram.com/sram/mountain/1x11