There is no IS version of the Canon 24-70 f/2.8 But, it is an awesome lens and even without the IS you it will work well especially because you have the proper stabilization gear.
For your 1 super prime I am going to recommend either the 35mm 1.4 or the 50mm 1.2.
For Audio recording I recommend either Fostex 2LE for $600 or Sound_Devices_702 for $1,800. Do you also need Mics & a mixer or is this just for recording the sound?http://www.bhphotovideo.com/c/product/264304-USA/Canon_8014A002_Zoom_Wide_Angle_Telephoto_EF.html
For your 1 super prime I am going to recommend either the 35mm 1.4 or the 50mm 1.2.
For Audio recording I recommend either Fostex 2LE for $600 or Sound_Devices_702 for $1,800. Do you also need Mics & a mixer or is this just for recording the sound?http://www.bhphotovideo.com/c/product/264304-USA/Canon_8014A002_Zoom_Wide_Angle_Telephoto_EF.html