It looks pretty nice. I wish I can have a tank this big so that I won't have to trim my plants so often. I wish you good luck for your first planted tank, and it is a 125g. I don't believe most people would start out their first planted tank with a tank this big. It is just that when sh-t goes wrong, it can become expensive.
I'm not sure where you got the idea that larger tanks size would preclude trimming as often? I would still be trimming a larger tank just as often only difference is that it would take longer to trim each time because there's more plants to trim.
Also larger tanks usually have more room for me to correct mistakes/problems that occur, so in that instance bigger is better IMHO.