hello, would like suggestions for building a 7.1 surround. currently i am using 4350,s for just 2 channel. i have in storage 1 pair 4343's, and 4 pair l-100's. any suggestions on av receivers, separate amps and preamps? no bluray player or wide screen yet. is all this just overkill and big waste of time and money?, have a few thousand to spend. 2 channel listening about 50% of the time. would like to keep the current biamping for the 4350,s thanks for suggestions. listening room about 18 x 29 ft.