At curent prices you would pay 163.4 usd per MH for the first 10.000 units. (much more if btc will rise)
You will have a few months at most mining with profit , accounting the flood of scrypt asics.
Some examples:
  - 125  usd/MH - The War Machine GawMiners
  - 33.31 usd/MH - Titan KnC