I really like the ariat tall boots, but the only ones I"ve found worth buying from them are the $440 version of their tall boots. The cheaper (around $250) version has really stiff leather, and once you put on the $440 ones, ugg. You can't go back . . .the leather is SO much better quality.
But if you're not going to be doing a lot of big showing, I don't see why half chaps and paddock boots wouldn't work.