Well I've had a Kenwood 5.1 sound system for about 5-6 years now and am looking to upgrade since I recently purchased a nice plasma and after I was at a friend's house with a much nicer HT system. From what I remember he had Polk and his surround sounded much crisper.

After reading around in this forum, as well as some others I've decided on a Denon 3805 with the Polk RTi series fronts and center speaker. My question is, is there much of a difference between the RTi4 and RTi6 models. Same as for the Center. There is CSi3 and CSi5. I'm indecisive about spending the extra money. I will I hear much of a difference based on the money I'll be spending. Where I live I can't audition the speakers since no one carries them. Only thing here is a Circuit City (only carries Monitor series and Best Buy). Also any opinions on the FXi3 surrounds. One more, any opinions on the Polk sub. Looking at the 10" 200 watt. Should I be concidering another brand for the sub? I've been reading about the SVS....

hope I could get some responseds from people with more experinced ears. Thx...