California does have a number of flagships, but being in urban areas, and very close to Berkeley and UCLA, they aren't likely to be big time sports programs. UC-Davis, IMO, is the only one with any chance-and that would be many years off. They are just now joining Div I.
UC-Davis and UC-San Diego are often mentioned as being among the top public schools in the country, at the same level as UCLA. UC-Irvine is also highly regarded and UC-Santa Barbara and UC-Santa Cruz are major research universities. So California really has about 7 flagships.
Texas has 2 public tier one research universities. Houston and Texas Tech are not, but they want to be. There is a plan to bring them to tier one, but whether the funding and committment will be there over the 15-20 years to get there is uncertain. If it is, there will be one Dallas school to move along with them, probably UT-Arlington. But Dallas can't decide whether to back UTA, UT-Dallas or North Texas.
California really only has two flagships...
Cal and UCLA
Resource freshman admit rates as an example...
Cal-admits 23.7% of freshman applications (44.9% of 4.0 applicants!)
UCLA-admits 23.7% also (48.5% of 4.0 applicants)
Hence, as a freshman with a 4.0 gpa, you have a less than 50% of being accepted to these two universities, and it's getting tougher with the current California budget crisis.
The next tier is...
San Diego-41.0% of freshmen (D-II athletics)
Santa Barbara-50.9% of freshmen
Irvine-56.3% of freshmen
Davis-61.9% of freshmen
All except for San Diego (78%) accept over 90% of all 4.0 freshmen applicants.
At the bottom are
Santa Cruz-78.3% (D-III athletics)
These are only slightly tougher to get into than most of the Cal-State schools (in fact Cal Poly is probably tougher to get into than both of these!)
San Francisco is a graduate medical school that does not accept freshman and plays "club" athletics.
None of these schools is close to being put at the top level academically or athletically. The Pac-10 has no current viable California option that would be considered.