I think @Madazam has already paid so he has to choose one shitty options. @Madazam, there is no answer to it, and you have to calculate by yourself, e.g. when your item is expected to deliver, and what is the estimated price of bitcoin/litecoin.

HWYW may not be a good option, coz it only mine for you for at most one week and you have to give up your other rig. as for titan and neppy, you should choose wisely. no one can "predict" the delivery time, nor the future cryptocurrency price...