I have some pens I got at auction - came from veterinary lab - they used to house cats. Side and top wire is 1 x 1. Bottom wire is 1/2 x 1. All vinyl coated. Rabbits do chew on the side wires - don't know that it hurts them. One problem with the coated wire is that the coating makes the 1/2 x 1 openings on the floor a bit smaller and if the rabbit produces larger droppings, they won't go through the wire. Another is when I power wash them. Any place the rabbits have chewed tends to shred under the force of the power washer.
I imagine if you have smaller breeds, it'd work just fine. I'm not sure it's worth the extra cost. Make sure the wire is at least 14 guage, though, and that the floor has adequate supports. The vinyl doesn't do anything to prevent sagging