There's only a handful of games right now. I'd go with Assassin's Creed, Killzone, and either Knack or one of the sports games for a multiplayer title. If you currently have a PS3, many titles are cross buys. You buy the game for the PS3, get the PS Vita version free, and pay an extra $10 to get the PS4 version. I would also suggest the PSPlus card for one year, this will allow online play and access to a couple more free games on the store. There's usually about a dozen titles per year for free on Plus and gives heavy discounts to games monthly.