I don't think you're going to find any cheap 48h hubs less than 145mm OLD.
I'd just build with 36h Velocity Deep-Vs. That wheelset will last you 30,000+ miles, even if you re-shape potholes on every ride. Use loose-ball shimano MTB hubs (LX or something) and they'll last long enough for your great-grandkids if you clean and/or replace the bearings every 6 months.