I'm definately feeling complete after having my third. The urge has completely left me so i know my preggy days are over - so much so that i got them to clamp my tubes while they were delivering Isla. I know if i'd listened to my head and stopped at 2 then i would have always been wondering and yearning. I followed my heart and am very glad i did.
I can't say whether it's right for you or not but i would say follow your heart, you'll know.
all the best for the decision making ,although thi sthread was started a while back so you may have already decided!

Julie x