Stem Advice

ridebk
ridebk Posts: 2
edited June 2013 in Road buying advice
I bought a cannondale caad 10 size 50. I am 5'7" and have a relatively short inseam for my height. My ideal bike size would probably be a 51 but I got a great deal on the last 50 in stock at $1230 for the 2013 model.

I want to extend myself a bit from seat to bars. This bike fits my legs perfectly but I feel slightly more upright then I would like up top.

The stem measures about 90mm from center of bars to center of headset.

What stem should I look for? Would 120mm make a significant difference?

Is there something else I should look into?