I saw pass and find an original model second hand with the OLED screen.

Is the 8GB memory card enough for it?

I just rebought a Vita a few days ago. Using my old 32GB card and it doesn't quite feel like enough anymore. The problem is PS+. You get way too many games over time. If you ignore PS+ and buy your games physical, 8 GB is fine.

Borderlands is pretty bad. I don't know how much they've improved it but last I saw it was running at 15-20fps.

Original Vita isn't frafile. Slim doesn't feel like as good of a build quality, but it feels ok. I would recommend a case to be on the safe side with the slim but I'm going naked with my slim.

No.

No.

Wipeout 2048, Super Stardust Delta, Geometry Wars: Dimensions, LittleBigPlanet.