I will throw in my 2 cents.
When I started my LS1 swap, the LS1 motor I bought came with an automatic trans. I have always believed that a sports car has a manual trans and I love rowing through the gears. I talked myself into believing that I could be happy with an automatic in my 240z and went as far as installing it into my car with the LS1. Well as I got busy at work, my car just say on jackstands in the garage and I kept on thinking about the auto trans. I finally decided that my Z had to have a stick shift. I bought a 6 speed and installed it on the car. Now that my car is on the road, I am so glad I went with the 6 speed. I love to shift.
My daily driver has an auto-stick that you can shift manually. It is not the same. Nothing like being able to side step the clutch and do a nasty burnout or rev the motor and match the down shifts. No to mention hitting 2nd gear and having the car start to slide out from the back.
Go with the manual. You will be happy that your car is still a sports car.