Need some help comparing Nikon wide angle lenses for a DX shooter?

So I'm a bit of a photography newbie, but I'd love some help in understanding the differences in these 2 Lenses.

The Camera I'm using is Nikon D5000 and my favorite thing to shoot by far is landscapes.

AF-S DX Zoom-Nikkor
12-24mm f/4G IF-ED

I've heard some pretty great things about this lens, but I'm not exactly wanting to spend tons of money on a lens.

AF-S DX NIKKOR
10-24mm f/3.5-4.5G ED

This is the other lens I've considered because of the lower price and fairly comparable specs, But I'd love some input on how different they actually are.

Thanks all.
Added (1). Also, I'm wondering how safe it is to buy used lenses from the Nikon website.
Added (2). Also, I'm wondering how safe it is to buy used lenses from the Nikon website.

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