Hi there,
Thanks for posting, and sorry to hear your prior applications did not work out as hoped. Based solely on the info provided here, it looks like you've got a good start, in terms of a great GMAT, some solid work experience with some specific leadership roles and examples, career goals that fit with your prior experiences, extracurricular involvement.
In terms of re-applying, if you re-apply to any of the same schools, be sure you really focus on what has changed since last time, and on presenting yourself and your strengths in a new light. Be sure you redo all essays and that you really research each school to demonstrate a good fit with the program. In general, in terms of what you could improve on from last time, it's tough without viewing your full apps (and we do offer a through ding review and re-application strategy package, if ever interested), but I don't have info on your academics here; and perhaps the essays didn't make quite the impact they could have-- that is where the school is really getting to know YOU! I would also be careful about how you detail your career goals and your reasoning behind WHY you need the MBA... make sure it's clear that you do need the degree to reach those next career steps, and in terms of your own business if that is your longer term goal, be sure it's realistic and thoroughly thought-out if possible.
As far as schools, there are many factors to consider. Perhaps you want to research Duke, Darden, Kenan-Flagler, Anderson, even NYU? In terms of the loans and co-signors, the best advice is to check directly with each school as policies can and do change, but there are also many threads on GMAT club over the years about that topic so you could search here as well.
Good luck and keep us posted!