Hi,
You can have a variety of crystals, see the 877a datasheet for the range, however would suggest 4mhz is a very popular choice with 22pf capacitors.
You could use 15pf or 27pf caps but they would alter the timing slightly, better to stick with the specified values, they are a common enough.
8 ,16 and 20 mhz are frequencies also used quiet often, though for 16 and 20mhz the circuits will show smaller value caps, typically 10 or 15pf .
Have you any thoughts on a particular frequency ?