My next move, apartment building or residential expansion

[Marco Campos]

Hello all, I need ideas/help on my next real estate move.

I have excellent credit, $150K salary, Aproxx: $450K net worth, and $150K cash. I have 3 years experience from owning a mega cash flowing 4-plex and just purchase a cash flowing SFH (2 loans total). Est at $30K in total cash flow.

I am leaning down 3 options:

A) Buy an apartment building. Can anyone give me an idea of what I can afford based on my stats?

B) Expanding via the residential properties...max out 10 loans then kick in the snowball effect of paying them off.

C) Searching for a good partner(s) to buy an apartment building since I have little commercial experience.

My goal is to build the most cash flow w/some hope of appreciation.

FYI, I Ultimately want to get my MBA in Real Estate and move into apartment buildings or other large projects (major passion for real estate). I am just not sure if I should make the jump now. 

Thank you all for your time in advance.