Just get RADEON GPUs or buy currency. Mining will require as much luck and timing as buying. Mining scrypt with anything else than Radeon GPUs now is a waste of time. It is nearly a waste of time to mine scrypt with Radeon GPUs already to without them it is really pointless. You would have to have excellent timing to start mining at a very low difficulty and if you are that lucky, it stands to reason that you would be equally lucky just buying coins instead.