Spokes are not the primary problem, they're stronger than you think.
1. Get a beefier rim - for all the strength spokes have in all guages - they're limited by the rim they are built into.
2. As already suggested, try to go 48 hole if you can.
Straight guage DT Swiss 14g and just about any brand 13/14g single butted stainless steel spoke is good enough spoke wise...
=8-)
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5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life