Some web sites that I check out for track stuff are:

fixedgear.americancyclery.com
www.bikecult.com/works
www.ucycle.com/fixed
www.businesscycles.com
www.sheldonbrown.com/harris/fixed.html

For general stuff like brakes, seat posts, etc:

www.chucksbikes.com
www.icyclesusa.com
www.cambriabike.com

Surly hubs and Open Pros sounds good for your wheels. Other components like seat posts, handlebars, etc. are pretty straight forward. I would just get cheap stuff.. For your cranks, track cranks are different from others because they only have one chainring and they are spaced to work with the track frame/rear wheel. Additionally, different track cranks also require different bottom bracket sizes. Most companies have a bottom bracket that they recommend with their cranks, which is probably the easiest way to go, but as long as you have the right size (Sugino 75 cranks need a 109mm bottom bracket for example) you should be ok.

-Jason