Listen to them and see which ones you like better. No one can tell you which ones you should get. If the Pioneer are worth the cost go with them. If you like the Polk better, then you saved some money. I generally prefer polk speakers over pioneer, but I do not know what each speaker sounds like off the top of my head.
I guess I should Have worded it differntly. It was more of an In Your Opinion thing. I can listen to the pioneers but not the polks. I am not to picky Just wanted Some more highs.