Speakers to match my center (1st setup)

I'm working on building a home theater setup and buying components piece by piece. I had a few questions regarding multiple topics, but my main inquiry is about my speakers. First off I live in an apt 11x18 (noise is no issue because my upstairs neighbors spend most of their time fighting each other and don't complain about anything). I wanted to figure out what a good setup was and my price range is 200-700 per component, but i'm willing to go above that if necessary. I have a CS2 center channel speaker from polk and was wondering if i should match those with the recommended series of tsi500's or the rti-a7's for my fronts. Is timbre matching that important that there would be a significant issue whether i use the 500's or the a7's with my current central channel? I was originally going to use the satellite RM8's all around but I keep hearing that satellites just don't cut it for mains so I was interested in something bigger. Are the rm8's a good idea for my surrounds because I was still considering getting those for that purpose? I also wanted to get a nice sub and I was reading a lot about SVS and Epik on these forums which are both brands I've never heard of. I was thinking about an Epik phoenix, but it may not be necessary regarding whichever speakers I get for my mains. If I were to order an Epik sub, does anyone know how good their customer service is should something go wrong?

Also I was wondering what is a good option for a receiver, my price range is a bit flexible but I don't want to spend more than $2000 on a receiver. I was looking at the yamaha line and I was trying to figure out wheter i should go with the rx-v2065 or the rx-v3900 model. I know there are other good brands like onkyo and denon I just don't know enough about their models and performance to judge how good they are. Any help would be greatly appreciated.

Haha nice, I don't want to spend more than 2-400 for the 2 rear surrounds (5.1 setup) but i'm willing to go up to a max of 1000 for a pair of floorstanders. It looks like paradigm might be a good brand but do you have any other suggestions? Keep in mind that I'm very new at this sort of thing so any advice would be helpful. Additionally, should I stick with the center I already have and just add on to that?

Thanks for the suggestions calnbs, those psbs look really nice. I haven't had the opportunity to actually have a good listen to a lot of different speakers, I probably have to find more stores but i've really only listened to polk. I forget the model I was listening to but i was underwhelmed by them and also the paired subwoofer they had but I'm guessing that it was just low end equipment. Do you have any ideas as far as other brands that are worth taking a look at? Where do you typically go to listen to speakers, I would figure something like best buy, but their demo room was lackluster in that there were no dedicated setups so that I could actually get a feel of what a good system should sound like. I'll admit I don't have a full understanding of ohms but I know that a mismatch isn't a good thing, will the fact that those psbs are rated for 6 ohms be a problem with a decent receiver?

2-3k at most.