If I were in your shoes I'd probably go for either a used 5D with a 17-40mm F4L, a portrait prime (lots of choices), 70-200mm F4L + Canon TC 1.4x or a 40D, 50D plus a tokina 11-16mm F2.8, Tamron 17-50mm F2.8, a portrait prime and again 70-200mm F4L. Toss in a macro lens, a light tripod and maybe...