Many years ago I had a Nikon 35mm SLR and later a Canon A-1 SLR. Years later I bought a Sony P&S and later a more advanced Sony P&S. Over time, I began to realize the limitations of using a P&S.
I have make the jump to a D700 and have had it for 4 days. So far, it appears to be all I hoped it would be and more. I have had no trouble jumping from a P&S to a D700 DSLR. The camera is very intuitive and the User's Manual is well written and easy to use.
If you have some background or experience in photography and want to move up, I see no problem making a D700 your first DSLR.