Memory Card Help for Project Diva f and f 2nd

Alrighty so let me explain this. I'm planning to get Project Diva f 2nd, but I'm having trouble deciding what memory card to get to have soace for both the previous game and this one. I have the teeny 4GB memory card(I seriously hate this one with a burning passion*sets it in flames*), and I have no idea how much room having both games and the dlc will take up. I know someone has to have everything in their Vita so if someone could help with memory cards that would be great. Its sad wanting such a great game, but having so little space. ;_;