flyboy1987 -
Commuting hub to hub is very unpredictable. There are quite a few CAL pilots that do it so you can bumped very easily as a junior pilot. There are alot of flights between the two locations, but the status of these flights in terms of loads change more than any other two destinations CAL serves.
I'm not as familiar with the Houston 756 lines, as a 756 pilot I'm sure Otto could add some better input, but a lot of the lines are domestic, MCO - IAH 757. EWR - IAH 762 for example. One of the only problems of being a 756 EWR pilot is that you may get stuck being an IRO. You might never get to land and currently the newest contract killed the dead-head pay.
On that note I really don't envy the newhires going to the 777. Less dead-heading, but they'll basically be an FE.