A fourth option you may want to consider is private equity (technically falls under finance but you only mentioned IB). Take my opinion with a grain of salt, but from what I gather from my own research, it seems a lot of O&G groups like to have a couple guys with engineering experience for the operational side. I assume the background helps to some degree in equity research as well. I don't know enough to comment on how PE analysts' hours compare to what an IBD associate works.
Wall Street Oasis has good info amidst a shitload of trolling and uninformed clowns. Also, there's a poster on here that might be of help if he/she sees this thread.
This post was edited on 11/22 at 1:52 am