I wish I had the option to play 999 first. Probably a wise move.
Since I have my Vita with me at work, allow me to do a list as well.
WipEout (Although I might trade this in. I enjoy it, but I have had it since launch and have had my fill)
MGS HD (Finished MGS 2, need to start 3)
Mutant Blobs Attack
The Warriors (PSP)
GTA: Chinatown Wars (PSP)
Resident Evil 3
Persona 3 Portable
NFS: Most Wanted
Virtue's Last Reward
and various other minis.
Looking at this actually makes me feel ill haha. I don't think I have completed a single game on my Vita besides MGS2. Adding Persona 4 and Stranger's Wrath won't help my cause.