If your bars are lower than the top of your saddle, buying a stubby, short stem won't solve the problem. You need a stem that will bring your bars up level with the saddle. With a traditional stem, you could simply get a tall Nitto stem of an average length. With a "modern" stem, you need need a long stem with lots of rise.
Any good bike shop can look at your bike and figure out which stem you need in two minutes. Don't bother with "hit or miss" on E-Bay. Get a professional fit from the professionals at your bike shop.
Ritchey makes an adjustable height stem that sells for around $70. You can bring the bars up for riding in traffic, and lower them if you ever feel like pretending to race.
Last edited by alanbikehouston; 08-22-07 at 11:11 PM.