If you are thinking you want to play a five man team at 80, then you better be prepared to spend a ton of time levling. 70-80 is just brutal. Getting 2 more from 1-60 is nothing compared to the last 10 levels. The worst thing you could do (I know because I did it) is to level 3 to 80 and realize you want a 5 man team and then have to go back and do 2 more from scratch (cause me to quit doing another 2 from 70-80).