You can buy 5.1 speaker sets - this removes a lot of confusion about buying speakers that blend well together, and buying a subwoofer that is similarly well blending. After that, just buy a 5.1 receiver and you're good to go.
Although, if you want to make it even more simple, I know you can buy HTIB that use an Onkyo or Denon receiver, paired with a 5.1 speaker system by a different manufacturer.
For example, this Denon with Boston Acoustic speakers: http://www.frys.com/product/7349194?site=sr:SEARCH:MAIN_RSLT_PG
If you aren't getting something like that, or an Onkyo, the odds are good you'll be getting something with proprietary connections (and even if it didn't, it'll probably be an under powered amp), and it'll have a blu-ray player integrated into the amp.
My personal recommendation (and I am biased) would be a Klipsch 5.1 speaker set - http://www.klipsch.com/high-definition-theater-500-home-theater-system
- with a HK receiver - http://www.bestbuy.com/site/Harman+Kardon+-+AVR+700+375W+5.1-Ch.+A/V+Home+Theater+Receiver/6087379.p?id=1218716258541&skuId=6087379
How married to 5.1 are you? My favorite audio set up I ever had was a pair of Klipsch F-30s (two 8" woofers, bass baffle, 1" tweeter, the Klipsch horn), they were gorgeous, sounded magnificent! I had 5.1 satellite systems with tiny speakers, and the surround effect did not make up for the inferior audio quality (much like with cars, there is no replacement for displacement). I only say this to suggest you think about quality over quantity - maybe you'd be better off spending your money on 2 really good speakers?
I have a sound bar these days, which is arguably worse than either, but with toddlers toddling and being in a condo at the moment...