Speaking of speakers:
Both Wharfardale and KEF are respectable and high quality speaker makers, but Wharfardale is trying harder to bring more bang for a pound

While I didn't heard the towers you're looking at, A while ago I did auditioned Wharfardale Diamond bookshelfs and enjoyed the sound a lot. Quite warm and pleasing, yet very precise.
Highly preferred is you find local brick and mortar store and listen them for yourself.
Specifically, between these Wharfardale and KEF towers - while both at 88db sensitivity, KEF is spec'd at 8Ohm which would be easier load for you receiver - you could get them to play louder.
Also between Non-Elite Pioneer's and Yammi - I'd take Yammi any day