I use pistachios instead of pine nuts, gives a lot of the same flavor and if you use good fresh ones they're green so they add to the greenness of the pesto =)
I think it's worth the extra cost to get the real Parmigiano Reggiano, it has a lot more flavor then the imitators.
Oh and be VERY careful if you are heating it, both the basil and the Parmigiano are very easy to burn.
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