Wow, all this upgraditis and we're not even all the way through spring yet! Rather than ponder component or cable upgrades, to me, by far the best investment anyone can make is to address issues with the room acoustics. IMO, it's the second most important (or tied for first with the speakers) variable to account for, yet it's the most oft neglected part of most audio systems. My home theater system "1.0" is now finished, although I'm still considering tweaks with the room treatments, like going with higher absorption rigid fiberglas panels and buying (or building) bass traps. My system description is linked below.

http://gallery.audioreview.com/showp...cat=500&page=1

Toady -

If you're making notations about weaknesses in the room, then an investment in some bass traps, wall coverings, and/or acoustic panels would seem a higher value addition than interconnect upgrades. Furniture and "stuff" most definitely help, but a lot of time domain problems require some strategically placed absorbing material at the reflection points.

P-i-P -

If the room rings at 80 Hz, you might have a standing wave occurring at that frequency. Might be time to experiment with a parametric EQ (I regard this as a necessity for most systems with a subwoofer), bass traps, or a different speaker positioning. My room had a +14 db peak at 88 Hz, which made the bass very boomy, and the parametric EQ got rid of that and allowed me to set the subwoofer level higher for a fuller sounding bass without any hint of boominess.