Invicta has been running 3m/100t
w/o Micros and gold 860k
W/ Mircos and gold about 751k
which nets between $640,000 and $749,000 per 50 tech
Even if you do 3m/150t (which really is a junk deal all things considered)
you still net between $140,000 and $249,000 per 50 tech
Universities reduce tech cost further (10% each) but you considering you have to invest in 3 schools and can only get 2 universities, better to get factories instead an stretch your money as far on infra as possible.
tl;dr - Get Microchips and Gold. 3m/100t nets 749k. 3m/150 nets 249k.