I'm hoping to book a RTW from Edmonton-London-ISydney-Edmonton - YEG-LHR-SYD-YEG, with a side trip from LHR-ACC (Accra, Ghana). The RTW portion costs 200,000 miles economy and 300,000 business/first class. I have 230000 miles and am scrambling to add an additional 20,000. I would love to purchase the remaining 50,000 I need from a 'friend' at 1.5 cents a mile, but may have to resort to buying them from Aeroplan at 3 cents a piece. The routing is optional - I am looking for advice on how to get the most of my miles and with the greatest comfort, i.e. busines/first class. and the least amount of surcharges. Any and all advice will be taken in on this very steep learning curve that I am climbing.