Jonas,
I have a matched stereo pair of U87s and will warn you that even though they are great mics, unless you have a highend mic-pre to go with it, you will be much better off using the cash and splitting it between a good mic-pre and a couple decent mics. (like a V7 or C3, one of each.)
Also, let me warn you that when you have that much invested in a microphone, you will have a heart attack everytime some singer gets a little too energetic. Therefore, you need to invest in some heavy duty studio mic stands, (not the standard stuff.)
Now your investment has just climbed to a lot more money than just buying the mic.
Owning these type of mics, (at least in my opinion), is like adopting a kid. You will go to extreme lengths to take care of them since they are a significant investment.
Of course, you may be independently wealthy, so in that case, enjoy the mics.