As you have posted in the Entertainment computers thread, I can only assume that you have a media pc to connect all this gear to. If not, then bugger off and post in the correct forums!
Dont get the 427XD. Its a television panel and thus is problematic with media pc's in so much as they dont do proper pixel matching very easily. Get a pioneer PDP-42mxe20. this is the same panel, processing etc but is idealy suited to media pc use as it can pixel map at 48, 50 & 60hz. No other plasma panel can do this at 42".