HopefulMBA92:
In writing this up, it was really tough to give you meaningful advice. Ultimately, it sounds like it comes down to:
(1) Oxford: guaranteed seat and fun UK-based experience
vs.
(2) US: risk of having to get in somewhere reputable but gets you in the US/build-in network
Ultimately, while the former situation is appealing, the latter is a more practical consideration for your decision here. So, I would aim for a US-based school. There will be less inertia in the short (and potentially long-) term for your career. I wouldn't want to go into an MBA program thinking that I need to work hard to build a network outside of my core MBA class and, on top of that, have to find a job that isn't even in my home continent.
Therefore, I would definitely diversity the range of US-based MBA programs on your list for your new application season. Throw in a few 'reach/targets' schools (possible reapps) as well as safety schools.
You might also want to also see if you can defer Oxford or at least how a re-application might be perceived. If you can somehow pull that off with Oxford, you might still be able to then decide between those US programs to which you are accepted and Said in possibly 6 months from now.