Hi...
Just finished wiring my lights not to long ago. I was going to use the junction bar you mention, however, I decided to purchase a fuse block (Blue Sea) and run a hot wire straight from the battery to the fuse block. I used an in-line 80a fuse link between the battery and fuse block. You can get the fuse link at most auto parts stores. They use them for those big amp stereo rigs. I decided on the fuse block as I was pretty sure I would be adding more and more electric goodies, and sure enough, I have lights, horn, and gps power line running to it already. I will be adding additional lights soon. Good luck....