If you want something cheap and bombproof, look here:
http://www.ebay.com/itm/Shimano-Deor...item4acb98bfac Be aware the spoke holes are not offset so radial is probably best (I built a wheel with one of these.)
If you want light, get one of those ~77g hubs straight from China for like $35. I built a wheel with one of these too, seems fine.
Rear hubs, you're on your own. You should be able to find a Shimano 28h rear hub easily enough. If you know where to find decent 24h rear hubs let me know!