Congratulations on your Sansui!
It pretty easy to tell people to get vintage Sansui receivers because they really are great. If you are happy with your Wharfedale W60D's, then I would stick with them.
Speakers are subjective and people are very passionate about it. I personally like the vintage Sansui speakers. They are typically very efficient which helps make mid power receivers like your 6060 play your music effortlessly. They are very well made and typically a crossover recap is all they need. Plus many have a very nice hand carved grill which is seems to fit them.
One the down side, Sansui made an amazing number of them. Some not so good, some pretty great. So you can't listen to two or three pairs and think you know what they all sound like. You need to listen before you buy.
Of course this may start a speaker holy war.:sigh: