Wynn,
First and most importantly I want to wish you and your wife all the best for your upcoming birth of your daughter. I hope everything turns out perfect!!!!
Next I want to say that you will probably find the 4 cell 4000mah just about perfect for your plane.your setup is almost exactly the same as my SV11 except I am using a Will Hubin timer. Even your weight is right there. I think and differences in numbers between us will be only because of prop selection and line length's, and maybe time. I have flown with a 4 cell 3600 but I was really at my limits, so that may be as small as you will be able to get away with. I want to wish you good luck with the plane too. I really like the way it looks!!
William