I don't think Bradford would bring much in a trade. Teams don't seem to be willing to part with much in the way of draft picks for older players. Heck, it's hard enough with young players. Henson gets a 3rd round pick. Dillon gets a 2nd rounder (looooow 2nd rounder). I think Bradford finishes the season in Houston and then will move on unless he takes a huge pay cut.
Armstrong is looking like he can become AJ's John Taylor or Mark Duper. I think he'll start seeing more playing time and more passes thrown his way. He's got serious hands.