Everybody is voting for 1.5, but how are you planning to study? Three is no official text book, there is not much mock text available so how will you test your skills?
I read it quite a lot in the current that SCJP 5 will land a good job. Frankly, i do not think by mere SCJP 5.0 one will land a good job,. In fact most of the employer look for SCJP , and most often they do not look for 1.4 OR 5. I agree that SCJP 5 is latest, but very few companies have started using it commercially.
your comments welcome...