Since you have a 7-1/2 I would think hard before getting a no. 8. I have both the 7 and the 8. One advantage of the slightly wider blade on the no. 8 is that it may help in jointing really wide stock or in bringing a box's sides to the same height when the walls are thick. It may be that a no. 8 would span the width around the corners fully where the 7-1/2 might not if the walls were really thick. I'd guess the likelihood of that scenario occurring would be small so I would not buy the no. 8 unless you came across a need for it. I keep a normal frog on the no. 8 and a high angle frog on the no. 7, to better handle different types of wood.
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