Help with Amp choice

[Eischman]

Need some help on what type of amp(s) (2 channel or 4) and how many watts I need
for an A/V receiver, lets start with what its got to power,
My setup: Main speakers are Polk RTi 10 (I run the "A" speakers from the receiver to
these, for the "B" speakers I run it to a Adcom 6 speaker selector that runs 5 sets of
speakers, but never all at once (2 at the most)
My current A/V receiver(Yamaha RX-V2095) is 100watts X 5, which is fine for movies
and my surround sound, BUT... when it comes to 2-channel stereo the RTi 10's and the
other speakers on the Adcom (Polk RTi 6's and Cerwin Vega DX bookshelf speakers) just
don't have any PUNCH!
Do I get a 4 channel that runs my mains and the Adcom 6 or 2-2channel amps for them both,
The Adcom 6 is rated at 200 watts max and the RTi 10's are 300 watts/Ch max

THANKS for any input!!