20pf / 22pf capacitor for standalone arduino board

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i'm looking @ designing own arduino board. i'm following project:
http://www.maungs.com/lwins-blogs/diy-arduino-uno-on-breadboard/

i noticed uses 2 22pf capacitors on crystal, while page suggests use 2 20pf caps:
http://arduino.cc/playground/learning/standalone

are both correct? can freely choose between 20pf or 22pf caps?

also, first link points page on sparkfun 22pf caps:
http://www.sparkfun.com/products/8571

i saw rated @ 200v, wonder if use 50v cap instead?

yes , yes.

i regularly use crystal
http://www.dipmicro.com/store/xc7-16000
and these caps
http://www.dipmicro.com/store/c1k22-50


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