I agree with the others on the SM7. The AT4050 is another nice reasonably priced mic. The Sennheiser MD-441/U is also a very good dynamic for studio vocals. The AKG C414 is a studio staple.
Leave the SM58 with the road gear. It sucks as a studio mic regardless of Michael Jackson.
Turner Model 1 C-LB, Seagull S6+, Ibanez 12 string, Dean Bavarian Vendetta
VOX AC50 CP2, Roland RE-20, Boss CE5
Kurzweil SP88X, Yamaha MM8, Roland R-5
TASCAM 38-8, Behringer SX4882, Alesis Midiverb III, Alesis Midiverb IV, DBX 262, DBX 266, Omnifex DDX1024, TASCAM DBX Type II NR
Sennheiser MD441, Shure SM57, SM7, Sennheiser 402's