This is gut wrenching. I have about $1200 to work with and am really starting to get into my photography. I've decided that this is something I want to pursue and am no longer looking at it as a hobby. I've read tons of information from this forum and other sites, books, magazines, and spoken to many people. I have a pretty good grasp of the fundamentals and have taken most of the advice from this forum to heart. I shoot family and friends for free to build my portfolio, I read everything, and now I have an internship with a local photographer who will really challenge me artistically and show me what it takes to run a business. So my question is, should I take the plunge and get a used D300 and save for some more glass or get the D90 and the Sigma 70-200 2.8? I'm primarily going to be shooting portraits, seniors, families, children, and when I'm good enough weddings and events. I know the d300 has the superior build and is weather sealant (living in the Seattle region this seems like a good idea). I also know it has the better focusing (51 pt focus?). But I'm confused on the full frame thing? What does this mean and how will it impact my photos? I think I can pull about $500-$600 with my current gear on CL so I may be able to talk the wife in letting me spend about $1400. I might be on the couch for a night or two though And I'm also confused on how older lenses work on these newer bodies. I know my current glass will but if I do buy older stuff will it work equally as well? Meaning will the motors in the lenses work with the new bodies? Truly appreciate the advice and help!