battery relocation...

I installed a POS Taylor box in my coupe. There has to be something better out there. They are supposed to bolt to the frame wich is a pain if you have a stock tank. The Summit box looked better but pics can fool you. The Taylor box will hold a monster battery though.
 
Wanting to relocate my battery to the rear of my 1980 notch.. Is there any kit that is better than the others? What kit do you all recommend? And is it pretty basic on how to wire it all? Wanting to clean the wiring out of my engine bay and the battery needs to go to do so. Any more info will be helpful :)