I personally have a Bose 2.1 PC speaker system that I bought about 5 years ago that with my old 46 inch projection and I feel that they are excellent, maybe a bit of distortion at max volume, but they are no Lifestyle 16 series.
Now I posted those big polks a while back, but decided that because of the frequency response variance between my center channel, surrounds, and two mains I ended up buying a
http://www.newegg.com/Product/Product.aspx?Item=N82E16882269004&cm_re=energy_take-_-82-269-004-_-Product because I didn't want to spend much and using them with the polk psw10 sub and have been super impressed (I also only paid 149 w/free shipping from newegg).
Seeing that you have a pretty hefty amount of disposable income though I think you should go for the Bose lifestyle 16 speakers and either the Pioneer you linked or any of the higher end Onkyo receivers, perhaps the new Onkyo with network connectivity which is really nice if it's even out yet.
Also the Bose tend to have much easier and varying number of ways to mount.
Go listen to Bose if you haven't already.
And if you do not want to spend the 1300 on the Bose speakers along with the cost of a receiver, than I'd just peruse Amazon and Newegg for decent reviews on 5.1/7.1 speaker packages.
Best buy has a good amount of the super high end speakers and receivers on display in their Magnolia setup as well.