Cash positive rentals don't last very long in any market.
Temeculaguy, you make a good point.
Now, I think that rents will go down in Temecula. That's because the glut of houses will attract cash-flow investors which will increase the rental supply, thus, result in lower rents.
So, the fact the numbers currently "pencil out" doesn't mean that they will "pencil out" in 2009. This is especially true in places like Temecula where there is so much excess inventories & builders are still building.