Is the Denon 2313 price increase make it that much better than the 1913. It has less power per channel. I have the 1913, unopened, then someone told me that the 2313 is much better. I could still return it. I got some Polk Monitor 70's for cheap. The 1913 should be fine for these right? I'm new to this whole HT thing.
The power per channel difference will be moot. The main difference is the 2313CI offers the better version of Audyssey MultEQ XT than the 1913, but yes, the 1913 will be more than sufficient for your Polks. There's no reason to spend the additional funds unless you have money to burn.