Which kids of booster seat should i get?

should i get somehitng like this Eddie Bauer� Deluxe High Back Booster Seat - Oak Harbor or something like this or this Graco Turbo Booster Seat - Pink? she is only 2 right now and has a good car seat that still fits her but i read that when she is 3 she can have a booster seat.. but not sure which one i should get.want to get it now before she is 3