Another tyre thread!

My tyres are now 7.5 years old, so although they've only done 17k, I've decided to change them.

It's a Plus 4 with 16in wire rims fitted at build with Avon ZV5 205/75 R16 91W.

91W? Why? Seems a little bit over specced and/or optimistic to me!

Any consensus on what I should replace them with?

Thanks