It's true 610 cabs are a great alternative to 810. It pushes pretty much the same with a more convenient form factor.
Which one do you prefer between the Ampeg and the fender 610?
I like the Fender better overall. For what I was mainly playing at the time (punk and hardcore) the Ampeg was super easy to get a tone that sat well. The Fender just has a wider range on it. Both have adjustable horns but I find the Fender to have a wider range and leaving my head settings at the same place, I can drastically change the tone with the Horn to fit with whoever else I'm playing with.