First off, i dont know the price if a D100 but your budget seems low for a DSLR with a good lense. I would reccommend the fuji S6500 (not slr) which i use and i find it a fantastic camera, very adjustable, no dark pictures (providing you know how to set it up properly) and fairly compact (but not a credit card camera by all means, still looks the buisness)
Just and example.
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Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip
Adobe Photoshop CS4 Extended
AX-10 Crawler - Thats all I have left!!!