This sometimes happens usually when the radar seperation minima is lost or the ATC is for sure that you will not have a chance to land behind the preceeding.
I'd rather stick with the TOGA momentarily and back to CLB. (If I have Flaps 1 at least)
Otherwise you are going to deal with the MCDU ( 1DIR to a waypoint. New destinanation and fill perf or COPY SEC and delete and clear ) which means PNF will be head down for some time and PF will need to check. By the way once you are doing this ATC will start vectoring for another approach most probably.
You need to make a PA also.
So in this heavy workload situation I would prefer to use TOGA momentarily and back to CLB rather. Then VS to 2000 FT. On downwind ACTIVATE THE APPROACH and you ae ready.