You need to think about the type of environment you want to be in. Do you want a highly competitive environment like Johns Hopkins? Or a place that’s a bit more laid back but still challenging?
Schools that “guarantee” admission to their med school usually have a very stringent set of criteria for you to get that slot. It’s only a guarantee if you can meet their GPA and test scores.
If you want to ease the financial burden, you could also look at some private universities that aren’t big names like Harvard or Johns Hopkins. There are many schools that would be willing to give you merit aid with your stats, and would give you the solid undergrad foundation you need to succeed in medical school.