I think Byrd, Levitre, Nelson, and Urbik are the most likely to stick around. I also put Merriman and Jones, but that's because I didn't read the question well enough to see you meant "re-sign before the season starts." I think those two will actually have very solid years, especially Jones. I think he will surprise a lot of people this year.
McKelvin will be gone, and I think Moorman may be on his last leg (nyuk nyuk).