You have a number of questions here ....
One suggestion - don't wait too long to take your test. I would suggest that you take it 3-4 months after you started preparing. That works best with the routine and also your memory will be fresher and would yield a much better result. It is probably more effort and more intense but I would aim for that.
Also, a new book just came out from
mgmat - GMAT roadmap. I have reviewed it and it is a great collection of study tips and routines that you probably have forgotten about (sounds like you've been out of undergrad for a while).
Emba vs MBA is a pretty easy choice - EMBA wins hands down in most cases. It is usually paid by the employer and you usually don't take time off for school (thus not losing any income). You also have a completely different mix of students that are more on par with you (though any top program will have a great student mix, they may be in a slightly different stage in their lives)