913 D3 and Shafts

I currently have a 910 d3 with a very cheap stiff shaft. First i would like to know if it would be worth it to upgrade to the 913? Secondly if i currently play a 10.5 should i get a 10.5 or 9.5. I am 16 and i get better as time goes on. Lastly, if i should upgrade what is the best stock stiff shaft or reasonably better than stock after market shaft. Thanks.

Hunter, 

The 913 will offer more ball speeds across the whole face.  You will be getting a much more forgiving and workable driver in either the 913D2 or 913D3.  Since they both offer many different shaft options as well as loft options, I would recommend you allow a Club Fitter in your area assist you with finding the right combinations of head model, loft, shaft and setting.  There are many combinations that could give you the optimal ball flight and total distance, but a certified Club Fitter would the best person to consult. 

Here are a few Fitters near you:

Montclair Golf Club (las)

Advanced Fitting CenterWhat is this?

25 PROSPECT AVE
WEST ORANGE, NJ 07052-4238 (1.4 miles)
973-239-0160

Essex County Country Club

SureFit CartWhat is this?

350 MOUNT PLEASANT AVE
WEST ORANGE, NJ 07052-2737 (3.3 miles)
973-731-9764

Canoe Brook Golf Shop

SureFit CartWhat is this?

1108 MORRIS TPKE
SUMMIT, NJ 07901-3700 (10.2 miles)
908-277-2683

Cameron

1-888-TITLEIST