How much you going to blow?
AKG C1000 is a 'small diaphragm' concdensor. Though not a bad thing your real industry standards for all sorts of vox _tend_ to be large diaphragm condensors such as:-
real industry standards....
Neumann U87 (especially set in omni mode for a choir)
AKG C414ULS
Cheaper variant from Neuman:-
TLM103 (same capsule as the U87 but doesnt have the selectable patterns - exceptional value for money)
Or you might try an AKG Solidtube, thats a great mic for the money.
Going down the scale I have a lot of time for the AKG C3000
You could also get great results cheaper with a matched pair of Cascade Fat head II ribbon mics, they are very smooth, dont extend as high as the condensors but are really lovely sounding.
http://www.cascademicrophones.com/ca..._Blumlein.html
A C1000 would do it, but you are more likely to see it as a drum overhead where someone cant afford C414s than for recording choirs seriously.
IME,IMO,YMMV and really not knocking JimmyM's excellent cheaper solution at all....