LHR->SFO->SNA

I am a regular traveller to LAX but really do not like the A340s and was considering going via SFO on the lovley B744.
Also when I travel to LAX I am actually heading for just south of Irvine in Orange County so John Wayne or possibly Ontario would be better as the traffic on the I405 can be horribe when the VS07 arrives.
So any thoughts on the extra cost/time? I am not sure if there are any special deals for the internal flights but it often takes me more than an hour to drive to John Wayne from LAX.
Also when I travel to LAX I am actually heading for just south of Irvine in Orange County so John Wayne or possibly Ontario would be better as the traffic on the I405 can be horribe when the VS07 arrives.
So any thoughts on the extra cost/time? I am not sure if there are any special deals for the internal flights but it often takes me more than an hour to drive to John Wayne from LAX.