Any expert miners out there able to supply any advice in this area?

Hello everyone,

I'm new to Bitcoin and to mining. My colleague and I have, however, done a little bit of research and have decided to begin mining with some ASIC Miners.  We are going to start by investing into 750 GH/s worth of miners. And the plan would be to roll up any immediate earnings into additional miners and equipment.

Long term goal would be to continue to do this, even to the point of upgrading electric service at our current office if necessary.

Is this still a viable profitable venture or are only the Pool owners themselves and those with 100s of Terrahash able to profit at this point?

I've read somewhere that as long as you double your hardware (Capacity?) every couple of months you can remain profitable?  Just looking for some solid advice as to whether or not investing some money in this fashion will be long-term profitable.

If 750 GH/s is not an ideal place to start, what would be ideal?

Thanks and have a great day

*EDIT for typos