How did you get $150k without having any idea what you were going to do with it? Pay me some % as a consultant and I'll give you some advice.
And I'll give you some for free, which will be worth every penny you pay for it.
By autumn, 150K will likely buy you, retail off the rack, between 10 and 15 Thps. By then (think Avalon, KnC, bitfury coming online in force, and BFL at their rate) the network could easily be as high as 750 to 1000 Thps. You would then be, at that rate, somewhere around (1/10)% of the network, or somewhere around 4 (rounded) BTC per day.
At that constant rate, and under $100 BTC xRate, you would be looking at around 50 weeks for gross revenue to cover capital investment. Alternatively, you could back-of-envelope pro forma 1000 Thps steady state for the network, and thus, use that 4 BTC as a "constant" rate.
Money for Nothing and Chicks for Free is in it's final few weeks of run. Make sure you and/or your investors understand bitcoin mining is rapidly morphing, best-case, into an attractive-to-some, reasonable-risk-adjusted return business.