My finding (correct please if I am wrong)
[1] Ignore I have SCJP and go for Java SE 8 Programmer I 1Z0-808 ($245)
[2] after that you are good to take Java SE 8 Programmer II 1Z0-809 ($245)
My aim is to get 1Z0-809.
[1] Use SCJP for an upgrade
[2] Upgrade to Java SE 7 Programmer (retiring Dec 31, 2018) 1Z0-805 ($245)
Now I am stuck with SE 7 certification (no meaning for me)
[3] Using 1Z0-805 go for Java SE 8 Programmer II 1Z0-809 ($245)
At the moment looking at $500 to get 1Z0-809..worth it
