some pros use handheld sm58's and 57's to record final vocals with.
but these were in pro studios, with pro engineers, using pro signal chains and pro ability.
if you cannot afford pro mics, then you can't afford them.
so don't worry about it, just go for the best performances you can get, and always keep your signal clean without clipping.
just don't think you can get pro sounds out of a consumer mic.
the performance is always more important than the sound, anyways.
always.
you should be able to get a good clear sound with a AT2020 (i have a AT4033 and love it)
good clean (conservative) levels, not too close to the mic, use pop filters, the eq to taste at mixdown.