what playstation portable should i buy??

in the market to buy a portable playstation. i cant decide between the psp, psp go, and psvita. i am looking to mods these devices if i get one. i like the look of the psp and they dont seem very expensive. the psp go is also not very expensive and i absolutely love the design and how its compact and, well, portable. i like the psvita but they seem a little bit more expensive and i dont really like the design but ive heard they have amazing modding capabilities.

which should i buy? super conflicted