Wow have to say the full frame/half frame camera thing just went right over my head but I think if it was in my terms your basically saying that the full frame lens will work on both a half frame and full frame but not the other way around? I will trust you and just go with the one you have worked with.
I have to say that I wish I could just get a kit now instead of picking it all out myself since I'm really confused now. Yet since I have to pick my lenses out myself......Say the standard 50mm lens you talked about does it make the camera basically a point and shoot? I'm going to try and explain what I mean better. Say your taking a picture of a bird house in your yard it's 15ft away you snap a picture and it looks 15ft away and you get half the yard? Or you can take a picture of that same object from the same distance away and you get basically just the birdhouse less yard?