Don't get the SM58, or keep it but also get a condenser microphone.
SM58 is a dynamic microphone that's good for on stage performances because it is durable and it generally is reliable.
In the studio, you usually want a condenser, and judging by the amount of money you are putting in your studio, you should really get a side address condenser microphone for recording vocals. This is key because condensers are generally better at handling a larger frequency range, are far more sensitive, and usually contribute to an overall better quality recording.
For the condenser, you would obviously need phantom power and a mixer that supports such an option (most do.)
Oktava MK 219 is a good large diaphragm mic that is affordable. $149.99 USD for 2 of them)
For non-Russian mics, that cost a bit more, look at an AKG C-3000. $299 USD.