My personal take is that in golf, as in most endeavors, you need equipment that's "good enough." That is, it probably ought to be a bit "better" than you are, but you don't need to spend the $ to get absolutely top of the line. For a rank beginner, I'd guess low-end clubs from a reputable source would be your best bet.
My logic is this: you don't want to teach yourself bad habits to work around problems with the clubs, and you want the clubs to be able to help you move to the next level. If, as seems to be the standard example here, the 5 and 7 irons out of your cheap set hit the same trajectory when struck properly, you won't learn the difference between the two, and that will hamper your development.