Awesome Liz. It is up to you regarding buying a back up. That one looks like it has a lot of life left in it. I would probably hold off, but maybe shipping and availability for your location would make it good to have a back up.
Seems like grates crap out before the burners. Burners lots of times get changed out just because they get clogged up a little and people either don't know how or don't want to deal with cleaning them up.