My advice is to not use the 1.6V memory with a 7 series-chipset motherboard. The JEDEC standard for DDR3 modules specifies 1.5V or 1.3V parts. But, to answer your question, no, the BIOS will not automatically adjust the memory voltage (vDIMM) and whatever other voltages need to be changed to accommodate 1.6V memory parts.
If the SPD chip on the modules support Intel's XMS profile spec, once the computer is assembled you can enter the memory section of the BIOS setup and specify the desired (required) XMS profile which will set system voltages appropriately for the memory parts. That should be a one time change, but assumes the board will boot to POST with the memory at the default 1.5V setting.
The BIOS setup default is to initialize the integrated video and designate it as the primary video adapter if no other video adapter is present. I never had a problem using an ATI HD5850 in my 70K
The board will fit in any case that can accommodate a full size ATX motherboard. Shop for the case with the features you need.
The board comes with a utility/driver CD that contains a Windows 7 USB 3.0 driver. Newer revisions are available on Intel's support website in the section for this motherboard.