re: Go Falcon 9...
Shuttle cost is often quoted as about $10,000/lb, but I think that includes the support staff budget that varies based on launch rate. I think commercial launchers in the medium range are closer to $5000/lb with some Russian boosters available around $2000/lb. Mark Wade's online encyclopedia can probably provide more accurate numbers. The medium class boosters Musk quotes range from $1300 to $1450 per lb based on a single use cost basis. I think they expect to eventually start reusing these rockets which could reduce the cost substantially more.
Regards,
Mark