iPad Mini or iPad 4?

Ipad_logo_box_medium

I haven't been able to decide what to get, an iPad Mini or iPad 4.

I have an original iPad wish has now become my parents machine to mess around whit. I was going to wait for Apple to release the new iPad mini with the retina display, but that wont be till September.

So, What to you think? iPad Mini, iPad 4 or Wait for the Mini w/Retina?