recently I found a great deal on Craigslist for a pair of Trek road bikes.

Both 54cm

I ride 56-58cm

I see the problem that I keep the handlebars level with the seat, and my seat is above the handlebars about 5cm.

So can a higher stem help me with this? The stem is pretty short on the bike and is already far past the "Recommended" height. I'm not too sure about the size of the stem.

btw, will take to LBS for opinions, but the closest LBS is expensive, the one across town is the good one.