Best Answer - Chosen by Voters
A master's at a lesser university.
It doesn't matter if you have a BS in chemistry from Harvard, unless you have a PhD, you can't become a professor.
So basically, no matter where you get your bachelor's from, unless you have a master's or PhD, it will be very hard to get higher positions. You need certain degrees, and you can't replace a master's from a state college with a bachelor's from an Ivy League.
Besides, what you really need to do is look into whether the programs at whatever colleges you're interested in have highly trained professors, excellent research opportunities, and which program focuses more on whatever area of chemistry you're interested in.
Just because it's Ivy League doesn't necessarily mean it's going to have a better program than a cheaper school. And employers know whether the chemistry program at a certain Ivy League school is comparable to that at a cheaper school.