No, right now you can take either, although I think getting the
SCJP 5.0 is better, I look at resumes and I would take a SCJP 5.0 over a SCJP 1.4 because I know the 5.0 exam is tougher.
I still say the K&B book is the best book to get. There is another out there, but I don't think I could compare them.
Mark