Don't forget the MXL line of mics. They make a mxl604 small diaphram condenser that comes cardiod ,but includes an omni capsule. I think they sound WAY better than an octava 012 and can be found new for under $100/ ea.
Also you might want to check out the V69 mogami version. It's a toob mic for around $300.00 We shot it out with several other much pricer mics and on this perticular vocalist it won. FWIW.
Other's suggestions sound good too. an SM7 would be nice to use on several things..
Lets see.. so my 2 cents then:
(2) MXL604 $200
(1) MXLV69 $300
(1) Shure SM7 $300 (used)
(2) Shure sm57s $180
Then maybe one of those Nady ribbon mics to round out the collection.
But, as usual there are many different ways to do this thing we call "recording "