yes, yes, and yes. you just need the other type of firewire cable that goes 6pin to 4 pin. i dont recommend getting an adapter, better of just getting the whole cable.
whoever said presonus doesnt work with an sm57 is a fucktard. its just a mic... if its not working well, its because the person doesnt have a clue as to what he is doing. just watch your gain levels. go ahead and get a firepod, i have heard nothing but good of them. i dont have one myself but i looked at it, but i got a digi002 instead.