You might also want to check out an IRO Rob Roy, they look to be pretty stout bikes and it looks like the whole thing(with components and wheelset from IRO, which are all sealed bearing) would run you ~ $600. Rack and fender mounts, clearance for 35c tires, 32c with fenders, heat treated tubing, and that great IRO customer service and warranty.

http://www.irocycle.com/fixedgearand...inc/id111.html