Stay away from the saddle pictured above. You can see that the saddle is not made to fit a horses back and your horse WILL be sore if you use that saddle. Those cheap saddles are not made to fit rider or horse.
A lot of people like treeless saddles- I've heard they're very comfy for trailriding!
They do make treeless saddles with horns.
And trust me, you will be less likely to need something to hang on to when you ride in these. My husband has one and it actually helps you stay in the saddle so much easier. I hope to afford one someday.