I have a Canon 18-50 mm lens right now.
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If your Canon dSLR has a 1.6 crop factor (30D, 40D, 350D, 400D etc) then I would recommend the…
Canon EF-S 10-22mm f/3.5-4.5 USM.
It’s a very good lens, well worth the expense, because it will outlast your current camera.
18mm is already wide. You did not state what model of DSLR you have, but more than likely you have a camera with a sensor that is not “full frame”. In other words, the sensor is smaller than the 35mm frame size, so in effect, any lens you put on the camera will be subjected to a 1.6 crop factor. So your 18-50 lens will appear to function as a 28-80 lens would on a 35mm camera. I believe Canon is now making a 14mm lens, however that is not all that much wider than your 18mm. Your biggest problem is the crop factor of your camera sensor which kills your wide angle ability.
Heres a small list of good lenses in the wide angle range I dont know much about sigma but the canon ones are great and heard nothing but good things on the tokina
Tokina 10-17mm
Canon 17-40mm
Canon 16-35mm
Canon 10-22mm
Canon 17-55mm
with the exception of the 10-22 and 10-17 the others are pretty much the same focal ranges as your 18-50mm
What you have at 18mm is wide angle.
If you want wide, get a film camera, and a 24mm lens.
Rectilinear lenses:
Canon 10-22mm EF-S (crop only)
Sigma 10-20mm DC (crop only)
Tokina 12-24mm (crop only)
Sigma 12-24mm (crop or full frame)
Fisheye (Diagonal):
Tokina 10-17mm (crop only)
I think Sigma just introduced a crop only fixed focal length
Full Fisheye:
Sigma 4.5mm DC (crop only)
I’d highly recommend the Canon 10-22 or Sigma 10-20 if you like a nice (more or less) undistorted super wide angle. The Sigma 12-24 seems to have more distortion but that can be fun if you’re creative. The Tokina 10-17 has the fisheye “line bending” at 10mm but it slowly (and almost completely) goes away at 17mm if you like that kind of thing (I do).