Hmm, why would you want to get the least expensive nutes? Doesn't that seem to set yourself up for problems?
If I were you, I'd get a better quality nute like Advanced Nutrients and just use less at first to see how it works for you. It has a 100% money back guarantee, I think. Can't lose.
Of course, I've never had to return my nutes. LOL
Good luck - remember, sometimes you have to pay more in order to get the results you want. I mean, if you want crappy weed, go for it. I'm not smoking it...LOL