I've used the clicks, turbo and lace... and I have to say, my Knitpicks interchangeables (and fixed) are by FAR my favorite needles.
I like slick needles and flexi cords and... I don't like to spend a fortune
You mentioned that you want to grow with your set... and while KP doesn't have the 16" interchangeables, everything esle is amazing to 'grow' with. Plus the smaller cord-ed fixed needles are so super inexpensive.