I went ahead and let the dealership take care of it. The part in Houston was over $300, which seems weird that there is a pricing difference. I was already in a rental car for the day and the dealership is 20+ miles from where I work, so the avoiding the hassle of shuffling the cars around, finding a knowledgeable friend to help me replace the part for free, etc., seemed worth the extra $300.
However, I failed to mention in my original post that my A/C also went out a few weeks ago. Has anyone had this associated problem? The dealership checked out the A/C yesterday when they were diagnosing the other issues, and said that it was the A/C condenser and said that it would be over $1100 to fix. I pushed that off because I wanted to make sure that the fuse box replacement was going to solve the StabiliTrak/Traction Control issue before I sank any more money into this money pit of a vehicle. Miraculously, the A/C came on when I picked up the car this morning! Imagine that!
I am crossing my fingers that this is a permanent fix for all of the issues I've experienced.