Thanks heaps
Will i have to keep adding rigs as the difficulty gets harder or will this be fine for a fair while yet?
It depends. If the btc price keeps rising, you will make the same amount of USD over time. If you want to continue to get .28btc per day like you would until the next difficulty, then you would have to add 20-30% more equipment every 14 days.
Sounds expensive doesn't it!
I have heard about renting the gh/s and software with hosting do you think this could be a better option paying $10.83 per gh/s and thats for a 1 year contract?
Sounds like a much better option not having to worry about the hardware and elec cost