Budget 2-300?Preferably less!Am I setting it too low?
I wouldnt recommend a UWA purely for landscape work. It's actually very hard to do, as you have such a large area to fill, you really need to be close to a subject of interest as all you find you'll get is a large expanse of ground and not much else! They are hard to use properly.
I tend to use my 35mm more and more or landscape work.