Study scjp 1.6 (310-065) and take the exam on upgrade scjp 1.6 (310-066) per my opinion. Since there are less questions to attempt but the fee is the same ie $300.00.
but i rather go for scjp first and then switch for scwcd upgrade exams cause me have done scwcd 1.4.
And I am reading Head First Java 2nd edition i think this will be a good option am i right?