hey PJ
im no "expert" on all of this but ill share my opinions with you anyway
in the $500 - $600 range i would be looking at:
Denon AVR-789/1909 90w per channel x 7ch
Dolby TrueHD, Dolby Digital Plus, Dolby Digital Surround EX, Dolby Pro Logic IIx decoding, upscaling to 1080p, audysey multi eq room correction and setup, audysey dynamic volume and dynamic eq, zone 2, 3 hdmi in 1 out you will need to buy an ipod dock for this receiver (denon ipod docks are available seperately) RRP $599
Onkyo Tx-SR606 90w x 7ch HDMI V1.3a repeater (4 in/1 out, 1080p compatible) HDMI 1080i upscaling powered by Faroujda DCDi Edge, dd plus true hd all the latest audio formats and dolby codecs, audysey dynamic eq, compatible with RI dock for ipod, multizone. RRP $499
Yamaha RXV-663 Dolby Digital Plus, Dolby Digital TrueHD, DTS-HD High Resolution Audio and DTS-HD Master Audio, 95w x 7ch, iPod compatibility via Yamaha Universal Dock, multi-zone control compatibility, upscales analogue video to 1080p and also has pre-amp outputs incase you wish to add more power in the future, but only has 2 hdmi in 1 out. RRP $549
pioneer VSX-1018AH-K DTS-HD/Dolby TrueHD all the latest audio formats, 120 W x 7ch power, Phase Control, Advanced Sound Retriever, Advanced MCACC, HDMI repeater, upscalingto 1080p, multizone USB Memory Audio Ready, and iPod Digital Playback (Made for iPod) ipod can be connected via usb into this amp 3 hdmi in 1 out. RRP $599
sorry but im unsure if these include the wireless network functions maybe someone else could help you out there. Oh and the prices are from the websites so im sure you could find them cheaper
but all of these IMO are very nice receivers
hope ive helped a bit
~TiM~
Also the yamaha 663 doesnt support audio through HDMI as far as i know do you will need an optical or coax for that but the other three all carry audio through hdmi
so for the denon, onkyo and pioneer if you had either one of those amps you would connect an hdmi cable from the amp to the tv and then connect your other components such as your ps3 straight into your amp also via hdmi you dont have to connect to the amp from the ps3 via hdmi but obviously it gives you a full hd picture with the wii of course you cant connect via hdmi as theres no out on the wii for a hdmi cable.
the yamaha is still a great amp only difference in the setup is that you will need an optical cable for the audio and an hdmi cable for the video because the audio wont travel throught the hdmi
btw all those amps are the latest version of hdmi 1.3a