Saints trade up, using approximate value

Okay so what would it take for us to trade up from 29 to 20?

Our first ( 29 ) and 3rd ( 71 ) this year
The chart says our first (640 points) and third (235 points) this year gets us to the point total of pick #19 (875 points) this year. Tampa Bay has pick #19, so that trade gets you around pick #18 (900 points) or pick #20 (850 points) because you have to figure the Bucs won't trade with us.