In case we want to go with a comercial booster, here's some data on existing or planned launch vehicles which do comercial launches that might help.
Falcon 9: $35 million for a launch that will put 10450 kg in LEO or 4540 in GTO. Intended to be man-rated.
GSLV III: Cost unknown. 10000 kg to LEO or 4400 to GTO.
Ariane 5: Cost unknown. 16000-21000 kg to LEO and 6100-10500 kg to GTO, depending on varient. Man rated.
Rokot: $14 million. 1,950 kg to a 200km high orbit. Derived from an ICBM. Might be suitible for orbital testing or something
Dnepr-1: Cost unknown. 4,500 to LEO or 550kg to trans-lunar injection. Converted ICBM. May be retired in 2020, before we might need it.
Proton: Cost unknown. 20,700 kg to LEO, 5,000 kg to GTO.
Atlas V: Cost Unknown. 9750-29420 kg to LEO, 4750-13000 kg to GTO, depending on varient.
Taurus II: Cost unknown. 5500 kg to LEO
Zenit 2: $35-$50 million. 13740 kg to LEO, 5250 kg to GTO
Soyuz familly: Cost unknown. 6700 to 7800 to LEO. Man rated.
Delta II: $36.7 Million (out of date). 2700-6100 kg to LEO, 900-2170 kg to GTO
Delta IV: Cost unknown. 8600-25800 kg to LEO, 3900-10843 kg to GTO.
All data from wikipedia.