Quote:
I'd like to get more "width" in my shots and need some info on what's a good lense to buy.

I'm using a Canon Rebel XT and would like to spend no more than $300.
I know that Canon lenses cost much more than that, so I'd even consider a good "used" lense.

Lenses tend to be lifetime purchases, so a used lens that has not been abused can be a very wise purchase. Reliable dealers like KEH, Adorama and B&H assign grades to the condition of the lens as a guide. I have some pieces of used gear that have seen three or more decades of use.

I consider wide-angle lenses essential and a pretty high percentage of my images are shot with them. I recently purchased the 12-24mm Nikkor for my D200 and find it totally satisfactory. Even though it is just a 2x zoom, it goes from a 61

I use a Tamron AF19-35mm F/3.5-4.5 for wide angle work. It is an excellent lens, as good as a canon lens. New it cost about $340 but you can pick up used ones for a lot less.