the drop that looks "right" is between 1.8 and 2.25
no matter what your camber will suffer. people saying 1.5 will not cause problems either heard it from someone else and relayed it to you, or had on 14s with huge sidewalls so it couldn't be noticed.
also get name brand and not the cheapest crap you can find. in this hobby $50 is not alot of money but on things like springs it'll make the difference.