Replying to Lens Recommendations

I know it's the millionth thread ever about lens help, I just wondered if you guys could give me some advice though.
I'm looking to buy a wider angle lens. I have a Nikon D7000. The lenses that I have now are a Nikon 50mm 1.8, 18-55 Kit lens from D3100 3.5-5.6 and a Sigma 70-200 2.8. I really would just like something to use instead of the kit lens. Something sharper mostly.

My budget is really just how much I would like to spend on a lens right now.
I don't really want to get into my spending abilities, but I've been saving up for a new car after mine got totaled and I have insurance money from that, that will be going towards a new car this summer. So I have a good amount of money at the moment, but I would really like to spend as little as I possibly can because I really have to save my money for when I do go to buy a new car.

I saw a 16-35 new on ebay for $930, which seems like a good price to me.

I was looking at some 14-24's but those seem like a little much for me to be spending right now. Unless you guys can really convince me that a 14-24 is worth it, then I might consider dropping the cash on it.

So what would some other lower-budget alternatives be? Dropping 1800 on a lens just seems like a ton, while I'm trying to save like this.

Any other lens recommendations would be really helpful. Any experience based help would be great too.

Thanks a ton in advance guys.