I am not sure I even understand what your question is. But based on your post I can tell you a couple of things:
1. I don't think UTEP is on the list of the top 50 business schools in the US (Based off of the
Business Week rankings, at least). But at the same time, I think it's more important for you to be looking into the value that the MBA brings for you. At any given time, almost all the business schools in the US, which are decently ranked are pretty decent in terms of "education value". The true value of the schools you mentioned (Stern, Booth) is in the networking power, alumni base, faculty and infrastructure, among other things. If you already have a family business and you intend to develop it, then a UTEP MBA might be okay - but its a question you have to ask yourself, not us.
2. I mean this in the most constructive way possible, so please don't be offended if it seems rude. But based on your post, you really really need to improve your speaking standards by a VAST amount to even fall in the usual range of people who get admitted to the schools you mentioned, so that would require a lot of work, both on the GMAT and the essays. Putting in that kind of time commitment for an MBA, will again, require you to contemplate the value of said MBA.
And vannbj's advice is really sound as well. If the business is a high-risk one, then it'd be more fruitful to focus on the GMAT and get into a better known school for the value of the degree. But if the business is going to get you what you want already, then you might as well go with the UTEP program. Again, this is just my 2 cents and might not really reflect what's best for you - that, only you can figure out.