Grad Job Dilemma! CIA Analyst vs MBB vs TMT Equity Research

I've been quite fortunate to receive offers from the places listed above through internships and/or graduate recruiting.

I'm not sure which one I should pick, but what I do know is that I probably wouldn't stay for more than 3-5 years in any of these roles. Long-term, I'm interested in eventually starting an activist fund or a start-up.

Working as an Intel Analyst has been a dream job of mine for two years+, as it's probably one of the most intellectually stimulating careers out there. I've received a conditional offer, provided I clear the security clearance. 

However, I've modeled how much I'd be able to save if I joined the CIA, and it's roughly 50% of what I'd save in the other roles, for a variety of reasons.

I'm finding it very difficult to weigh the financial loss against the opportunity to pursue something I've wanted to do for quite some time, especially given my longer-term goals.

Any advice would be greatly appreciated!