Filters have different purposes. What are you trying to accomplish?
Nowadays, a UV filter's primary purpose is to protect the lens (at the cost of potentially degrading IQ, particularly flare and/or ghosting under certain conditions).
Whereas a CPL is basically like sunglasses for your lens. So if you do a lot of shooting in situations with a lot of glare (i.e. around, and particularly through/under water (e.g. fish in a pond)), that's where a CPL would have the most impact. (For more, see Gordon's CPL tutorial
And as far as macro filters (actually, filters in general), in my experience, you tend to get what you pay for. In other words, you won't get as good results with a macro filter as you would with a macro lens, but if a macro lens is out of your budget, then... yeah.
HTH - Mark