This is the one I use, it seems to be quite sturdy, and fairly tall:
I did have to buy an extender for it to fit the opening I wanted to use it in though because it was a wide space (wider than a typical doorway). I've had it for like 8-10 years now and it's still working. The only problem I've ever had is when I had a foster Shih Tzu he was able to squeeze through the rails at the edge of the extender!
It's metal, the plastic ones I've had before were all too flimsy.
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Jubal/Tesla (Beauceron) 3/14/14
Bianca HIC CGC TT (GSD) 4/24/04-10/23/12