PSP was a huge disappoiment for me because it lacked good original PSP titles. Few good games and that's it. After that being said, I've been playing a lot those PS1 titles that have been ported to PSP. It is awesome to play those classics on the go. It really is troublesome that I rather play old PS1 titles with my PSP than the original PSP games.
That's why I'm not really getting my hopes up with PS Vita. Game collection makes a good console so I'm going to wait for a while and see what PS Vita is offering on the games section. It would awesome to play those PS1 titles with PS Vita though