Id go for the deal if that is what you are after...but Id go out and listen to more stuff....if those were the choices you are looking at you really have alot of things to choose in that price range that are a lot better.
I should have chimed in on this since I have owned all 3...the AT4047 is the very best mic in the consumer market...even with the TLM102 out there it is the vocal mic to get...the SM7 is a good swiss army mic that will serve you well...I had the Octava...didnt think much of it.
Don't get a 2200 unless you want more inexpensive sizzle. I don't like that mic at all.
Get the Oktava modded first - definitely . The mic has a lovely capsule and with some modding it can be a downright good mic, period.
Consider getting the V67 modded second.
You will then have two pretty darned good mics.
Keep the B1 - what you get for it will be worth not much more than a decent dinner for two......just keep it as an instrument mic.