Join Date: Dec 2007
Location: Ballard, WA
Bikes: '98 Kona Kula, '8X Univega Sportour SS, '81 Trek 710
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Cranks are cranks, pretty much. They don't really care what kind of derailleur you use (provided it has enough capacity), what kind of chain, what kind of pedals, etc. They do care that the bottom bracket spindle is the right length.
In your case, you should be fine. 10sp cranks tend to have the chainrings closer together to keep the narrow chain from dropping between them. Since you will be using a 9sp chain, it shouldn't be an issue, and the spacing difference is pretty minimal anyway. FDs aren't as sensitive as RDs.