The vita, once modded and not being reliant on Sonys expensive proprietary memory cards, is a really great little handheld. Lots of homebrew capabilities, great ergonomics.
I also bought a PSTV when they were on clearance for less than 20 bucks, makes for a nice little gaming console for the bedroom or guest bathroom.
One of my favorite games was Tearaway, it used all the features of the console (touchscreen, tilt, back touchpad etc) without it feeling gimmicky.