Firstly, think yourself lucky that you're on the 777 & 747 and not the 787!
I once took an airport counter upgrade from economy to world traveller plus for 250 cad but that must be three years ago now. I think club was about 650 cad. I guess even by exchange rate now it must be higher.
Economy is usually very full on this route. Try and select good seats from seat guru or the dashboard threads here.
You may also find a 'proactive online upgrade' becomes selectable in manage my booking. Check out the cost of this. Being in WTP on this route means a good chance of op-up.