Subs, neon, and touch screen radio in dash. Do I need an extra power supply?

I have 2 12 aplines with a 750 watt bazooka amp and I'm about to get some interior and exterior neon plus a touch screen radio in the dash instead of the one in it now...do I need an extra power supply or can my car battery handle all of this. Personally, I think it couldn't but if I need another battery for a power source can I get a custom box made. It's an 07 silverado if that means anything with a duramax battery not stock...my brother fried the other one