Honestly, I have looked at putting 35-38's on an FX, and I don't think it would be a problem.
Nearest Specialized dealer is an hour (by car) away. I'm really leaning towards what my LBS sells/stocks for that reason alone. I like the looks of both. Will just have to see what feels best.
I guess the Misceo is a fairly new model (non-suspension) as I have not seen any posted on here, or heard owners comments. The FX has been around a while.