Several questions: Which is more preferable?

I am going to order an OXO style gun(small lightweight) for use with my 211 AutoSet.

Would you order centerfire or QuickTip?

Would you order fixed or moveable neck?

Would you order 10, 12 or 15 foot cable.
(They come with 10 - wanted a little extra length. Some say the extra will tax the drive motor and cause early failure)

Thanks for your valued opinions