buy a frame. completes around $800 tend to have weak wheels, and you're replacing most everything else. The weight difference between steel and aluminum is very small for the frame-only, and you'll find more options with steel for SS. I'd check out the on-one inbred 29er with the slot drop-outs. The pound to dollar is nice right now, and you can run it with gears or without, it's cheep ($350 shipped). Rigid forks for $80, decent wheels for $150-$250, a SS conversion kit, and cranks for $150, discs for $125... Tires'd put you over $800, but you'll have good shhh, and you'll never have to touch a set of tektro Io discs.