I'm not worried about BlueRay.
You already have a great turntable, and a superb arm and cartridge. I've never heard a Simon Yorke, but the reputation this 'table holds is stellar. If you really can get a "great deal" then it certainly would be very exciting to go that route. You have a very fine CD player too, so I can see good reasons for not thinking about SACD at this time in order to get the fine Redbook reproduction that often (but not always) come with the top SACD units.
The only thing I do not know - and perhaps you simply cannot know this either until you buy the turntable and fit it with your arm and cartridge - is just how much of an improvement the Simon Yorke would be over your Nottingham.
Is everything else ship-shape? Phono stage, amplifiers, speakers, cables, isolation, room treatment? Forgeting the SACD idea for a second, is the Simon Yorke upgrade the best way to spend your money?
Regards,