when things are rates in Mhash they should be talking about scrypt mining, when in Ghash or Thash it will be SHA-256
to the OP always check the payouts for the pool you want to use, somewhere on the site will be the payout structure, theres something weirdf going on with that site thus I cant find the page for you. But there is always a minimum amount that can be withdrawn if it is the 0.01 BTC it will take you a about a week to collect that with 2.7Mhash. thuis you will fall into the weekly deposits that fall on every sunday. If I were you i would point my miners there on a sunday that way you get a good full withdraw when the time comes.