I had the Polk RM87 a few years ago, their okay for what they are. But with the Crutchfield deal you would get the $300 PSW 111 free. I had that sub, in a smaller room it will work okay until you can save up and buy something better. But the Polk monitor series would be better that the RM87 IMO.
I agree with Iron Man, save money on the AVR and buy the X2000 and put the savings into the speakers. Speakers and subwoofers are the most important pieces of equipment in your HT in that they have the greatest impact on your SQ. Electronics change every year as technology changes. But speaker lines change much less frequently so we tend to keep our speakers for longer periods, meaning we are usually stuck with them for a while (unless we have money to burn). So I suggest you put as much of your budget into your speakers and subwoofer as you possibly can.
As a final thought I will say the best thing you can do is listen to speakers. I strongly suggest you take some time to demo as many speakers as you can. Speakers are very subjective, arguably the most subjective pieces of equipment that we buy. A speaker I like you might really hate. So you should not go off of anyone's comments, even though it makes the process of buying speakers seem easier. There's no point in you buying speakers for your HT that I like, you need to buy what you like. And the only way to know what you like is to listen.