I love my Tokina 11-16mm. See sample of shots taken with it here:
What draws attention in a glamour photograph? | Cultured Woman, LLC
If anyone has used the Sigma 8-16, love to see the results.
As for our friends question, if you do not have a camera, buy a used Nikon D90 and a used Nikon 18-200mm zoom. Most pictures taken on this site were shot using these:
Glamour Photography Scottsdale Phoenix Arizona
Only one very wide lense will leave you kinda crippled in range. The 18-200 will give you a great idea of which direction you really care to expand ur shooting.
Is great place to start shooting.
Do not buy the D90 new, is already obsolete, replaced by the D7000, which is out of your budget.
In a year or two, sell ur D90, and buy something else, or you may find the D90 is fine for you. It is quite a nice camera.
If you can't get the 18-200 in ur budget, and I think you can, you can pick up a 18-55 and a 55-200 VR zooms for about $250-300 used for the pair. They will still give you ideas on which direction you keep picking in your photography.