I've been a hobby photographer for a while and I am getting ready to make the leap into semi-professional, doing wedding photography and maybe broadening out from there as different opportunities present themselves. I have a pretty cheap little camera that I use, it is a 5.0 megapixel Lumix, which just cost a couple of hundred dollars and has really been the biggest camera purchase I've made in the past... So, for the wedding photography I am planning on making the bulk of my investment into equipment right off the bat, and get a Nikon D200 with all the needed lenses, filters, flash devices, memory, tripods, etc. - the problem with this is that I don't really know what lenses, filters, flash devices, memory and tripods I am really going to need. I would really like any advice from anyone here who has experience with the Nikon D200 and/or wedding photography? I am ready to make the investment, I would just like to make that investment as wise as possible. Also, if there are any books and/or websites that anyone would suggest for someone new to this level of photography, I would definitely appreciate it.