I am currently looking into buying my first shotgun mic for my first independent feature. Spent most of my wad on a computer/editing program and of course the dvx100a, and now need a inexpensive [but decent] mic. 90% of the film takes place indoors. Found a used but mint Audio Technica AT815a for under $150 ... any ideas on the sound quality of this mic? Worth the price? Any help is appreciated. Thanks!