since you're dreaming, why stop at 2ch's.....
charles fox has been experimenting with 4ch (schoeps) mixs and they smoke. toobes into two channels and then 4v's into a vms > 744.
cost not an object.....
After years of not only experimenting, but applying 4 channel recordings to a myriad of projects, I don't find it worth it. It's become more nostalgic than anything else for me. There are certain specific applications where this is advantageous, but I don't see it as a standard in taping, live PA or other stereo applications.
There are exceptions, though. My opinions are based on the fact that when people do 4 channels recordings, they are using microphones with very similar polar patternns; An omni & card, sub and Hyper, etc, etc. There isn't enough variant audio coming in from both sets to make a huge difference in the mixdown and warrant the process. It's only when you are mixing two entirely different patterns that you will start to see a true advantage to a 4 channel microphone mix.
Lately I have been recording with DPA 4021 & CMIT 5U (sometimes replacing this with the KMR 81i due to size) into a 4 channel mix. This is producing an incredible 2 channel live mixdown and also VERY fun to work with in post (moreso than my previous 4 channel work). The captured audio from the card is complimented very nicely by the high performing shotgun in many of the venues tested (implemented at Jazzfest 2006 1st weekend for a 5.1 doc). It probably wouldn't work well in a small room, but I don't see anyone running a 4ch mix in a small space unless for surround.