that depends on what you're capable of, i've already assembled a pretty decent bunch of four guys from the crydev site so not much more is needed at this point
I'm a coder, but I know my limits, so I couldn't help much with code. I'm assuming you have that handled, anyway. I'm very good with concepts, storyline, enemy / weapon design, and balancing out mechanics.
So if you need a content designer, or anything of that nature, let me know, because I'd absolutely love to help.