Sigma 17-70 vs WA and Macro Lens, Does Sigma 17-70 replace 2 lenses? Options

[Paulo Mateus]

In the end of the month I'm gonna purchase my first UW DSLR set. I had all figured out, until today.

I chose the Nikon D80 as it seems to be the best under $1000, and I was thinking about getting the Tokina 12-24 and the Nikkor 60mm. But reading the latest UWP Magazine issue, on Dave Harasti's article reviewing the D80 and the Sigma 17-70, I saw that it seems like a good (and much cheaper) alternative to the two previous lenses. It can take WA reef shots as well as close 2cm long nudibranchs, as Dave said.

I know that I would lose the wider angle from the 12-24 and the 1:1 magnification from the 60mm, but I think the $500-$600 (lens + flat port) less could justify the 17-70 option. Specially for a beginner like me, who has only taken UW shots with compact digital cameras.

Does someone have anything to say about the Sigma 17-70? Is it that good?

Thanks!