The Nikon 16mm f2.8 AF-D is great for daytime use, no CA that I can see in my photos, but I would rent one to see how it goes at 2.8 for the type of nightscape you want to shoot. I haven't tried it on the night sky but for daytime use it is a little soft in the corners unless I stop down a bit.
Only noticable on large prints though.
I'd pony up for the 14-24 though if you can afford it. Sharper than the Nikon 14mm f2.8 prime, and is just an astounding lens. You will never part with it!
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