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caveat: I haven't used the 24 mm F/2.8
For the subject matter you've mentioned, it sounds like 24mm is probably going to be a bit too long of a focal length.
Also, we're talking about roughly 2/3 of a stop in aperture (24mm F/2.8 vs. 18-70 at 18mm F/3.5), you could push your ISO a couple notches (ISO on the D70 adjusts in 1/3 stop increments) and get essentially the same result with your existing equipment. The kit lens may not be as sharp as the 24mm, but it's still a very nice lens, and you could shoot with it at 18mm.
It just seems like your subject matter is wide enough that the kit lens may be your better option for framing, and you don't have to push the ISO that much harder to get there (assuming you're inside).
If I had $100 to spend on a lens for indoor shooting it would go toward a 50mm F/1.8. Now that wouldn't help you with wide angle issue, but at F/1.8 it's nearly 2 stops quicker than the kit lens (actually at 50mm the kit lens is an F/4 as I recall, so it would be two full stops).
One other thing you might want to consider, I'm assuming you're not going to try to lug a full tripod around, so I'd recommend getting a little tabletop tripod ($25) if you don't already have one.
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mint
justapooper
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