I would most likley spend time with family who are currently living in London so a lot of time would be spent their but I have not included it in the price as I know I can get ~AUD$150 return to London from Oslo
The same can also be said about Los Angles where I would most likley find cheap Southwest or similar flights to visit a few cities from L.A but again that would be extra based on the price
Thanks for the interesting comments on G4 as I just found them as the cheapest airline but If any one can provide suggestions on getting to Los Angles . I have never heard of an airline that charges for carry on