Murph, I would definitely go for the D70 instead of the D100. It's common to think the D100 is the better camera, but this is not true. Build quality-wise, the D100 is better, but the D70 is one of those plastic fantastics. Faster frames per second, 1/500th flash sync compared to 1/180th on the D100, faster maximum shutter speed, broader range of ISO useage, and newer technology/sensor technology in general.
I've used my friend's D70, and it's a good camera. In fact, I fell in love with it for the one day that I used it, and I don't even shoot Nikon. It's the best bang for your buck, and also, you're just starting out in digital, so I feel that it's a good starter camera. Who knows, maybe a "D200" is just around the corner. Hope you make a decision soon, then buy it, and have fun.
T-1000