Thinking about getting a Vita, concerned about the memory cards.

[Saruk]

I really want a vita but I'm concerned about the memory cards, most of my games will be physical copies but there will be some I'd like to download (Plants vs Zombies, Super StarDust Delta, maybe Escape plan) I do not want to pay $99 for a 32GB card but 4GB seems so small. Can anyone who has a vita and memory cards tell give me some suggestions?  I don't plan on taking up space with music or pictures because the space is too valuable.