Bicycle Mechanics - Need new stem

So, I removed my handlebars last night, to clean up the area where the stem and handlebars meet. I was trying to fix this annoying pop that I was hearing when I was out of the saddle. Unfortunatly, when I was tightening the bolts I over did it on one and broke it off in the stem. There isn't enough bolt sticking out to grab with pliers or a wrench, so I think I might just go ahead and replace the stem.

The broken one that looks something like this: http://www.nashbar.com/nashbar_photos/medium/ZM-ORS.gif

What do I need for something a little fancier? I was thinking something with 4 bolts might be a little sturdier, but none of them seem to come in this configuration. I see Nashbar has a stem adaptor, would I need to purchase something like that as well?

Thanks in advance.

You can probably just drill out the screw, before you get a new stem. Threaded stems with removeable faceplates. Hmm.

That's one ugly piece of metal. I would replace it with a Nitto. Available from aebike.com (or any LBS from the QBP catalog). Be sure to get the right clamp diameter (probably 26.0).

Ugly? I was going to say that stem is 'FLASH'! (or Bling, like all the rappers say). I'd agree with operator and drill out (tap) the broken bolt and keep using that stem. 4-bolt faceplates are usually reserved for freeride or DH bikes...overkill on a roadbike. A Nitto stem would be fancier, but...

I'm not sure buying the tools for drilling out the bolt would be any less expensive than buying a new stem. I'll try to get pictures of the actual stem up later. Theres a used parts cycle shop in the area (Recycled Cycles in Seattle) so I'm going to run down there before I make any purchases. I was considering switching to a slightly shorter stem in the future, so this might be an opportunity for me to try that out.