I level quickly (hard to do as a priest)
I do not enjoy solo grinding
90% of my exp from lvls 20-60 was gained in instances. (30% of which were 4 manned to increase exp+loot or because people leave)
I intend to follow a similar path on the way to 70 (this requires the help of several compotent individuals most of whom I hope will come from this guild) This method minimizes down time.
I do not want to witness the opening of the dark portal in person LAGFEST (too many people will put it on youtube anyhow) 
I hope to run current 5man endgame content (STRAT, SCHOLO, LBRS) to avoid the uberlag that will be taking place in outland for the first week or so until Blizzard gets things stabilized.

Additionally harboring plans for a Bloodelf Warlock (leveled a gnomelock to 10 on another server during extended down time and loved the class, but hated the noobtard allies running everywhere dueling everything in sight no matter how many times I declined them)