I paid about $1200 for the brush bull 60" last year. $1300 would be a good price with probably about 4-$500 off retail if my calculations were correct on my purchase.
I have beat this thing pretty bad last year and just touched up the blades over the weekend. There are a few dents in the side skirts from rocks, but nothing major. I think the skirting is pretty heavy compared to some others.
Another nice feature is how the rounded rear is reinforced. I've been able to push all the brush/trees I've cared to try to grind up over with no damage to the unit.
I opted not for the chains. I just keep the kids and dog away when cutting, but if you have the extra $200 and people/cars/etc will be within striking range, then they will be a good purchase; however, some items can still be thrown out even with the chains.
Good luck!
Dave