Hi Tony,
I have the Revell kit of the -800 without the winglets and this is a very nice kit, the panel lines are finely engraved and everything is sharp with no major flash.
I don't know what engines come with the kit with the winglets, so I can't help there but I can tell you that Hawkeye Models does a set of Qantas decals for the -800 which includes the markings for the 75th Anniversary of the Southern Cross's flight across the Pacific. Hawkeyes website is at
Regards,
Chris