Hi to all!!!

I'm pretty new to all this but I am getting to a stage where I want to add a new lens to my collection.

At the moment I have a 35-50mm and a 50-200mm lens for my D5000.

What I would like is a wide angle lens for photos in small spaces and landscapes.
I've been looking at the AF-S Nikkor 14-24mm f/2.8G ED which around the $2000 mark.

Obviously, I am still new to this and this is quite expensive for a noobie.

Any suggestions on what other lenses I can look into to achieve the above without the price tag?
Is there "mock ups" of Nikon lenses that work well (based on experience) with the D5000?

Thanks in advance.