Yeah, I was looking for pikes that get big too and got Spilorhyncus' 2 Cincta females. I will be upgrading them to something 300+ and they will be living with PBass.
They are supposedly somewhat hard to find, and there are 3 basic color variants: Blue, green, and red. The 2 I picked up are the red variety.
In my search for big pikes, it looked like the Cinctas were about the biggest. They really have a good temperament (so far) going by my 2.
If you want to see them, there is a thread in this forum called "Two Cinctas" that was started by Spilorhyncus.
Good luck with whatever you get.