I was thinking about upgrading from the excellent RM6600 sub/sat system to a larger speaker system. Due to price and what I have read about polk's new RTi models, I will most likely want to get the Rti8's, fxi3, and csi3 system. But there are two things preventing that. One, my 6600 set is still fully functional and I don't know what I'll do with them. I have nobody to give them to and I don't want them to go to waste. Most people I've spoke to said to use Ebay, but I'm weary of it and never used it before. So I'm trying to see if there are any other options. It's frustrating how as fast as the technology is advancing, there is no way to trade-in or upgrade your system beyond a year like say with videogames and movies. So I feel sort of stuck. Second, I'm not sure if the difference in sound will really be worth it. I mean, I have a pretty large room right now where my system is (about 20'x15'x10'), but the sateliites are adequate with my Onkyo reciever. However, sometimes it's annoying that with music in particular, I don't have much midrange and at higher volumes, the sound loses it's "ommph" (and I do have a 12" sub). Would it be worth it? Can anyone offer me advice?