Originally Posted by axs
Seems like you are still not convinced fully or else you will not consider Bose for center channel. Having "timbre matched" front speakers are very important, so if I were you and was considering polks for front L/R, I will go with a matching center channel speakers from same line of speakers from Polk audio. If you are into 5.1 music also, stay with speakers from same line from Polk for rear surrounds also. You can do much better than Bose, if you stayed with Polk and do it much cheaper too.
Agreed, seriously. Stick with same brand (and preferably same series) of speakers for timbre-matched sound all around. (This does not include the sub, which can be any brand you like as long as it's not Bose, who doesn't make "subwoofers" anyway, just little quaint boxes you hook a bunch of skinny wires up to.)http://www.intellexual.net/bose.html
Polk is fine if you like the way they sound. Onkyo also makes very good receivers, no problem there. Be aware that you might find a deal at CC (or BB) but they're not exactly considered audio experts by anybody so take their advice with a grain of salt, and keep doing your research. You can likely do better elsewhere, either on or off-line.
Posting your budget would help folks give you more helpful suggestions.