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fkwThe main difference between the V100 and the Taylor PC is age. The V100 is from 1923 closer to the end of Cobbs career, and the Taylor like the other Detroit Postcard issues (Dietsche, Wolverine) are sometimes considered Cobbs rookie card (1907-09).
If you just want a nice Cobb, shop around and once in a while youll find a good deal. I picked this E121-120 up last week for $260, and you cant beat this batting pose.
Edited to add...
Maybe this card below is the one you were originally thinking of 
It is an Exhibit and it also has the same finished swing trees in background image. It is a 1921 Exhibit and sometimes found for $150-$300 in VG condition.
