[wintermute]

Im trying to decide which lens to buy for my D90.
I've got it down to:
Nikon AFS DX 12-24mm f4 (£600 used)
Sigma 10-20mm f4-5.6 EX DC HSM
Nikon AF 24-85mm f2.8-4D

I'm quite eager to try a wideangle but would also like a lens with day-to-day functionality which is why i've thrown in the 24-85mm.

Any ideas?

£600 is my max budget