Well bottom line is what you think is best and you know what your needs are. I would suggest that you get other opinions one the GPU. That way your reserch will be complete before you pull the triger. I agree with you on the superclocked.
Did you know on some programs you can OC your GPU's like MSI Afterburner also you can monitor your temps and set your fan speeds on your GPU. It is a good tool to have and it is free. We I want to wish you the best and I hope eveything works out for you.http://event.msi.com/vga/afterburner/download.htm