I've been looking for a new transistor to use in a differential pair. The differential pair will be part of an op-amp, which will be used in a sample and hold circuit. The supply voltage will be 0 to 5V and the input signal will go up to 100 kHZ with around 100 to 300 mV P-P swing. Can you recommend an N-channel MOSFET and/or JFET that will work for my project?