Best bang for buck speaker package from BB

I am setting up my first HT and am trying to keep costs down as much as possible. I will probably be using a Denon AVR-791 for the receiver and was considering the following from best buy (I want to take advantage of the 3yrs 0% interest). I really like the specs on the DT's. The room is 17' x 16' and I will just be doing 5.1 but may want to use the other 2 channels sometime in the future or for multiroom. What do you all think of the following choices?

- Definitive Technology - ProCinema 600 5.1-Channel Home Theater Speaker System
- Klipsch - HD Theater 500 5.1-Channel Home Theater Speaker System with Powered Subwoofer
- Klipsch - HD Theater 300 5.1-Channel Home Theater Speaker System with Powered Subwoofer

When you factor in 3 years 0% interest vs buying on credit card, yes, it very well could keep the costs down. Normally I don't do my shopping at Best Buy.

The bottom range of this Def system is what had me interested and I was just throwing in the Klipsh as alternate choices but was not very set on them.

My other option is this, I have Boston T830's which are old but still sound good that I could use as mains but I am worried about matching them. I am told by Boston Acoustics that any of their centers should match well (I am not sure how much I believe that). If I were to try and use my T830's I have considered the following options:

- Purchase Boston CS 225C Center - 2 bookshelf as surrounds - Bic or Lava Sub
- Purchase the Def system mentioned above and see how the T830's sound as mains.

Specs on the T830's are:
15 - 100 watts, 90db sensitivity, 8"woofer, 3.5"midrange, 1"tweeter, 10"w X 9.5"d X 32.5"h - non ported - 45Hz-20kHz ±3dB

In all honesty I had not even considered them because I have always heard that the receiver manufacturers do not make very good speakers. I will have to take a look at them.

Yes it would, but since when is HT financially sound? Let's face it, it is like buying a boat. Besides "cheaper online store" does not always = happier in the end. I know it is hard for some to resist going off-topic, but "where" I buy them was not meant to be a focus of this thread even though I mentioned BB was where I was looking at the asked about speakers.

Okay, those Pioneers do sound like contenders. How does the the following sound as another option:

Mains: My T830's
Center: BA CS 225c
Surrounds: BA CS23 or CS26 (which would be better sounding?)

The above Centers and Bookshelfs are being closed out so the prices are low and reviews are good.

Sub: One of the BIC's or I also like what I read about the Lavasubs.

Well if that was the case with what I am actually talking about here, then I would not even be considering BB. I am not looking at Polk, and the products I have mentioned here, have not been considerably cheeper anywhere else.

As do I, I buy from NewEgg and MonoPrice, etc... all the time. Rarely do I buy from BB but I wanted opinions on those packages I started the thread with and if you follow the thread, I am looking at other options as well. I should have clarified in my first post that by stating I was trying to keep the costs down as much as possible, I was referring to the price range of speakers I was considering. BB just happened to be where I first saw the packages that I started the thread with.