I have some stumps that are on the list that I'll pull this summer with the backhoe, the roots coming off it run into the trail so we have a good bump on one side. It will also make plowing easier during the winter.
If we did get a new attachment, I think we would either go with a chipper or grapple. The wife has been wanting a new couch which means a new matching recliner for me so that will come first. The "old" couch is in great shape but when we tested it out before we bought it, we thought it was comfortable but after having it for x amount of time, we think our older couch in the basement is a more comfortable couch. The dog likes the couch (either of them) so a newer one won't bother her.
Not sure about that stump grinder, but that is the exact compact track loader (tracked skid steer) that I want to upgrade to!