i agree with mshilarious on the 57 over the 58, actually his whole post is quite relevant...
i also agree with the guys pushing the cheap dynamic + cheap condensor idea.. i'd go for the 57 and something other than the b1. don't get me wrong i really like the b1 as an instrument mic (solid gold on bass cabs), but its a little too surgical on vox ymmv. for what its worth my singers goto mic is the 57, it just slots his voice into the mix.
what style of vocals are you recording mostly?