I found a manual for your Yamaha at their web site, and you are correct -- the RX-V595 does not have pre-amp outputs, making it impossible to add an amp like the 7100. The external decoder input is intended for use with a DVD-Audio or SACD player. Also, it looks as if the 595 may be able to handle 4ohm main speakers, but the center and surrounds need to be 6ohm or higher. Seeing as the entire LSi line is rated at 4ohms, I'm wary of suggesting driving them with the Yamaha.

You might get the LSi15's, put the RT10's at surround, and use the Yamaha with those four speakers until you could get the 950/7100, then get the LSi center and surrounds. Or you could get the 950/7100 first and add speakers later -- the RT10's would probably be very happy with the 7100's power.

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