Hmm...OK, you will have a "noise soup" I think. The vibration motor and servo motor will likely be the noisiest. Keep them on one end of the cable, keep the shift register pins on the other and put 100 ohm resistors on them to slow them down a bit. That's how I would start.
--
The QuadRAM shield: add 512 kilobytes of external RAM to your Arduino Mega/Mega2560