Why not a D60? It costs a lot less, and does excellent video without having to buy all new lenses. Video on a DSLR can be done on a shoestring, but, you will want a powerful computer, video card, and proper software. Macs are easier in this respect.
Then, ND filters, external mike, expensive tripod and fluid head, external audio recorder, sound sync software or clapper board, focus puller, external monitor or magnifier over the lcd to be able to focus, the list is almost endless.
Its pretty easy to spend many times the cost of the body on accessories to do video.
Start small and see if it really is something you want to sink a ton of money into.