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This is my logic with the CBR600. Age aside, 600 is more than enough. 100-110hp is still more than some cars on the road, power:weight massive vs most cars. So, easy to overtake, easy to get in and out of trouble.
Very easy to throw about in traffic, very easy to get points on the license. Easy to sit under the little wind protection at legal speeds, and mostly comfortable while doing it.
Any engine bigger is just not worth it to me. 600’s will do distance without crying.
Look at what price point the road fund licence goes up and then decide how much you are going to go beyond the speed limit. Then look at 600 and below.