Of these, Roland Berger is the most prestigious and the one where you are most likely to do MBB type work. I'd put ZS second since you profess a desire to do actual consulting.

In my experience, the research shops are often a bit disappointing though I don't know Cornerstone Research specifically

Last but not least, CPG rotation would give you a great CPG experience - very valuable, but not what you indicate you want to do.

Reapplying to MBB won't work until your profile changes significantly, most usually after doing a top MBA. MBB recruits from the top 20 in the US btw. All these roles would be interesting to get into an MBA; they may also be sufficient for you to reapply to MBB after a couple of years...

If I were you, I'd take them in the order listed and do an MBA no matter the path chosen. Congrats on getting so many offers btw