You say you love macro. If that's the case, don't buy the filters. You'll eventually, and quickly, reach the limits if the filters and you'll be disappointed soon.
Save the money for a decent macro lens.
If money is a bit of an issue right now, and you have good self control, set yourself up some sort of saving plan with the goal that the money will be for a macro lens. It make take a little bit of time, but the reward will make your pictures that much sweeter!