Avoid ANY hoe that's spent time with a hoe ram on it. They'll trash a backhoe in short order.
I worked for years for a contractor that had dozens of back hoes. We had the best luck with Case. Cat has moved to #2 on the chart in recent years. Ford/New Holland hakes a decent hoe. Deere does OK.
Extend-a-hoe's are great for deep digging, but the extra weight makes 'em a little vague as far as steering control on slick surfaces. (even with front bucket full of dirt)
I spent a couple days last week on a newer CAT 416. Loved it. I own a Case 580 Super M. Nothing but high praise for it too.