Pac-10 Expansion Speculation: Realignment into divisons

As a strictly mental exercise, I wanted to think about how the Pac-10 would realign if they did expand. There are a couple of possible alignments to think about. There is the traditional East/West Alignment, where a line is drawn among the cities that make up the conference and voila!

Now, all of these alignment assume that the Pac-10 takes the two most viable candidates, which are Utah and Colorado.

Alignment 1:
East
Colorado
Utah
Arizona
Arizona State
Washington State
USC

West
Oregon
Oregon State
Washington
Stanford
Cal
UCLA

Of course, this would break up the Washington/Washington State and the USC/UCLA rivalries. So why not go East/West, but with a twist: Take each of the pairings and split them up not based on pure geographical location, but based on their location within the pairing:

Alignment 2:
East
Colorado
Arizona
USC
Cal
Washington State
Oregon

West
Utah
Arizona State
UCLA
Stanford
Washington
Oregon State

Of course, you can always go with the typical North/South geographic realignment:

Alignment 3:
North
Colorado
Utah
Oregon
Oregon State
Washington
Washington State

South
Cal
Stanford
USC
UCLA
Arizona
Arizona State

Of course, there is another option, which makes no regard for the actual geographical location. It's more about trying to balance out the divisions with regards to the perceived relative strengths and weaknesses of the football programs while trying to do some preservation of rivalries.

The rivalries for those who wind up cross-divisional can be handled within the scheduling structures that the conference would create. I believe that this is sort of what happened with the ACC, and why they call their divisions "Atlantic" and "Coastal"

Alignment 4:
Division 1
Oregon
Oregon State
Washington
Washington State
Cal
UCLA

Division 2
Colorado
Utah
Arizona
Arizona State
USC
Stanford

Again, this is all supreme speculation, as Pac-10 expansion is still a long, long way away for being a done deal. But it does make for some fun mental gymnastics.