Suggest Alternative Medications Equivalent For Wellbutrin XL

I am looking for an EFFECTIVE generic equivalent for Wellbutrin XL (Buproprion XL extended release tablets) that is closest in all ways to the Valeant brand. The brand name Wellbutrin has been successful in treating my depression since 2004, but the dollar cost is very high. When I started treatment we tried the generic (as well as Prozac, which did nothing for me) but the generic was not effective. For about a 7 years, I was on 450 mg of brand name Wellbutrin, and did well. Over the last 4 years I was slowly reducing my dose (under care) but got cocky and went from 150 mg daily to zero last spring. I was all right until this fall, but am crashing. Under care, I have started the Wellbutrin again, just at 150 right now, which does not seem to be enough. However, an article I read said that generic formulations change over time, and if I can find a generic that works FOR ME, as well as the brand name, I would like to use that. Money matters. Could you please tell me which generic manufacturer has the formulation that is closest to the brand name drug, please?