Grading commons?

Is it worth getting commons graded from the 80's and early 90's if you have a chance of getting a PSA 10? I have a whole slew of 88 and 89 topps that have a good shot of 10's. Most of them are players I have never heard of. If i wait for another $5 special is it worth getting them graded if I can get a psa 10?
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Comments
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.