Tough question. If I were contracted by a company with a 120 kUSD budget, I would either first look to acquire a company like Avalon or put the money in a bank account. Buying a rig now is pretty much a waste of money, as the ASICs will arrive far to late to be profitable.
Avalon took in $25million for preorders... good luck getting them to sell for 180k 
Your math is off
300*1300 + 600* 1500 = 1,290,000
or roughly $1.3million.
Unless you know of a secret batch # 3?