hair dilema

My hair has been looking kind of shaggy these days...this pic actually acurately describes how I look these days.

This is me a couple of years ago (and boy i can't believe how i've aged since this was taken!!!)

Here is a picture of some hair i really admire...i've posted this before...i like the look but am also thinking i really like my hair longer ( i find longer hair more managable as I dont' HAVE to style is as much as shorter, trendy hair)

My dream hair... how many years would this take to grow? or how much would this cost to get extensions????