Hi, Ken. It'll be Pen*tax,* not Pentex. Pentex would be bad.
As for video tripods, those are usually steady enough, which is the point of a tripod, though the heads may be a somewhat awkward style, and which may lack the ability to shoot verticals, since video cameras don't do that.
For that sort of price we can probably do better for you, though: Dolica's a budget brand that seems to be making people reasonably-happy for the money: a non-video model might help you.
(This thread ought to be in the 'Accessories' forum, they may move it.)
What kind of work are you looking to do with what sort of lens?