how many plants are you planning on growing? I dunno what your setup is, but I would skip the odor control altogether (unless you are growing in a place where 4-6 plants would really stink it up) and invest that $240 to make sure you have plenty of soil, a fan, and then spend the remainder on nutrients, if you have around $150 left that should be plenty to get some decent nutes.

GL,

Mr. K

edit: after reading your post, I also wanted to add that make sure you have accounted for random, stupid stuff in your budget (extension cords, screws, whatever else) and also you might want to spend some of that $240 on mylar/white paint/something reflective to put around your plants