Welcome to WMAS! To answer a few of your questions lighting 2- 175w Halide lighting is more than adequate for that size tank, however there are several options. I prefer T5 lighting myself, it uses less energy, and produces much less heat. For tips on starting a healthy reef please read this thread, you'll fins TONS of great info
http://www.utahreefs.com/forum/forum_posts.asp?TID=9244
If you have any other questions or need help please feel free to ask!