One thing I would reccommend : get a AVR that can upconvert video (for the Wii ) .
When I bought my AVR I was hoping to plug everything into it ,and have just one HDMI cable from the AVR to the HDTV.
The AVR I bought did not upconvert , and I ended up running video cables to the HDTV and audio cables to the AVR. When I later mounted the HDTV on the wall , I had to buy a HDMI converter box in order to clean up the cables for the Wii. If I'd spent 30-40 dollars more and bought one model up from the AVR I have , I would have saved about $100 in cables and the HDMI box.
I would also get an AVR that can decode HD audio.Some time down the road you may decide to get a Blu-ray player or PS3 etc.
I was a Sony fan , but have now changed to Yamaha.
a Yamaha AVR with these features would go for about $400.
KDLW4100,BDP-S550,Wii,PS3,Shaw DCT 3416 HDPVR with 1TB exHDD,ATV2,Mission M2V 5.1 ,Klipsch RW-10D sub,HTR4063)