As a speaker engineer, let me say there are a lot of great speakers…that all sound different! Makes it tough, huh? And it is indeed difficult to tell what they sound like at Fry's as opposed to your room.
I think you should pop for the Outlaw sub. Fewer reviews because it is a less well known brand, but I'd say quite established by now. Hsu Research is another perennial fave as is SVS.
The for the speakers, I have a contrary view. In your setup, I'd buy 2 bookshelf speakers and I guess you need stands. Then when I had a bit more money, I'd get a 3rd identical one and set it on top of the cabinet under the TV. Sideways center channels need not apply! (They have off-axis sideways response problems due to phase changes. Those models with 2 woofers flanking a tweeter just exist because of price and because consumers are used to it, NOT due to any good acoustic characteristic. There are a few center channels with a midrange below the tweeter; those should be fine but more $$$$).
I've always liked NHT products, you can look at http://www.audioadvisor.com/Bookshel...s/products/49/
among others. Check the return policies! You can also look at "home theater speakers" instead of "bookshelf"
The Infinity Primus are a good value, but limited. I highly
recommend moving up to something with a 6" woofer and a 1" dome tweeter (not the tiny "balanced dome" like in the Primus). That will give you MUCH better sound than the cheaper stuff. So start with 2 speakers and upgrade later.
The speakers will last longer than you stay in your house, most likely, so it is actually smart to spend more. At these lower price levels, more money really does get you better sound.
Actually, let me reverse myself a bit. Get a really really good set of bookshelves. Spend your current money on that. You'll still want the low bass and eventually will upgrade to the sub. If you split part of the money to the sub and get lesser bookshelves, there is a very very common tendency to just settle for that and never upgrade at all.