I need to design a transistor amplifier which has operating frequency between 90-100 MHz. Voltage gain is 25.

What are the transistors that I can use for this purpose?

 

whoa! There are about 10,000 transistors to choose from.
You need to specify a few more parameters such as:

max operating voltage
current
power
power dissipation
package
PNP or NPN BJT
p-channel or n-channel FET

 

Max operating voltage: 7V
current : 5mA
package: Through Hole
NPN

Actually the sinusoidal output of this amplifier will go to a 74F14 IC.

 

Well that's easy. We have a link for this:

http://forum.allaboutcircuits.com/showthread.php?t=65137

Here you will see that a run-of-the-mill 2N3904 or 2N2222A will work.