Geordi commanding the Enterprise in The Arsenal of Freedom was always a highlight to me. I like how he motivated the bridge crew and took no shit from Chief Engineer Logan and then to rub it even more in his face took his job the following year. And it's one of the few episodes where they separate the saucer which was a big deal.
I also really like The Next Phase and his relationship with Ro there.
My other favourite moment is that Geordi was the only Star Trek action figure that I ever had when I was little. I had no idea who he was when I got him so I just called him 'Mr Man'. I used to get lunch boxes and fill them with water and then stick Geordi in the freezer thinking I was freezing him in carbonite or something. He eventually fell apart and I lost all the pieces except just a leg. I keep that leg in a little memento box. Last year I bought the same figure on ebay, along with a Picard figure. The Picard figure lives in my sister's fish tank but New Geordi lives on my shelf above my computer.