I currently own Track Kinetic, Kinetic Energy and Temper.  I am considering getting an old Ti Messenger plugged and re-drilled but I am skeptical considering I already have a few medium balls.  It seems I would just be adding a similar piece of eguipment and that any differance would be slim.  I am a stroker with speed around 15-16.
I would like to get some others thoughts on this first.  Thanks in advance.