The good thing is that VideoMic has integrated shockmount while for NTG2 you must buy one because VX2.1K has no place for a mic.
VideoMic will look like s..t on VX2.1K while it looks good on the HV30.
You should use the AGC in VX2.1K to have the reachest sound from those mics.
But you should control the area you shooting about the sounds.
When I am shooting I am closing everthing around (from music to mouths talking).
If I was you I would buy the NTG2 for the VX2.1K. Been there and done this.
I have had a Senheiser shockmount but I think that Rode sells a very good and cheap one.
NTG2+Shockmount+dead cat(windshield) for little money. A combination that can't be underestimated.
P.S. I have directed over 40 full shows with that combination. PD170+NTG2.