Looking to trade back a Nintendo 3ds plus more - how much money do you think I will get back for it all?

I do not play with the 3DS as much as I thought I would. I am looking to get the new HTC EVO 3D that is $200 dollars with my upgrade - if I trade in my Nintendo 3DS (box, charger, AR cards all in perfect condition), Super Street Fighter 3DS, Super Mario 64 DS, New Super Mario Bros DS, Pokemon White and an Action Replay - how much will Gamestop give me in cash for it? Hoping it's enough to get the HTC :) Thanks for the help.