Building up a set of wheels for my SS project and I'm thinking about Some 26" Aeroheats with Shimano Deore M530 hubs.

I have 2 questions:
1. I chose Shimano Deore because they are cheap but I wondering why they are SO much cheaper than every other hub out there. Can anyone report on it's quality? I don't want to spend money building up a custom set of wheels only to have the hubs break but OTOH I don't need a high end hub-it's just for a townie bike so I don't want to waste money either.
2. Where can I find an online spoke calculator that I can just insert hub and rim measurements and it automatically gives me a required length. (Non-Excel based)
Thanks folks