Don't forget that if you use a Legends character and level them up to 70, you get EXP potions that can boost any character from 1-70 or be used as extra exp. Got a Cannoneer to 87 playing casually in a few days (they are awesome btw). They are also tossing in free 1.5 exp boosters to help and a reusable VIP teleport rock that can take you to all of the major continents.
The event also gives out some decent equipment, scrolls, etc. you can exchange for coins as well as free standard full equipment sets for all jobs. They also improved the crafting system considerably.
And because of the event, there are giving everyone a character slot booster. Even if you don't want to play as a Legend you can use it for another job type which is great, though if all you want is just some extra storage space I'd suggest a Cannoneer because they get a passive skill that allows them to carry extra items right off the bat.
Final thing, the 2nd Legends Character, Mercedes is coming out tomorrow. Looks to be pretty interesting akin to a ranged version of a Dual Blader.
http://nxcache.nexon.net/maplestory/.../mercedes.html