For indoors, as long as there is carpet, the shotgun is best if it is overhead. If all else fails I work with the shot gun at knee level all of the time and the results can be excellent depending on the camera's audio.

You never mentioned what video camera you are using for HDV. Your audio results will vary.

The one problem with shooting the monopod camera is you need a second person to do that. YOU need to stay seated or standing at eye level with the interview subject just to the side of the primary camera. It helps them focus and be more comfortable if they are just talking to you. If they are standing, put a mark on the floor for them so that they know not to move around. Engage them in conversation and never tell them that the camera is rolling. Cover the red lights on the camera.

HDV edits nicely in Vegas if you are using V7. The VASST scripts work well, but since I demo and teach them for VASST I am probably not very objective. Edit in either HDV or in HD Cineform, then do your final render down to SD. Make sure that you do seperate renders and color correction for web, DVD and tape. Each needs a little tweeking to look good.