This Quartet adjustable easel can be extended to 66" tall (the pics were taken with the legs all the way in), it has a heavy steel plate at the top that display accessories can be attached to. This item is $243.89 at Staples.
From the Staples site:
Give presentations during corporate training sessions, road shows, and other events easily with this Quartet 66-inch-height 45-pound-capacity aluminum heavy-duty silver display easel.
Ensure high visibility of presentations with this heavy-duty silver display easel. The adjustable height allows for simple accommodation of various crowd sizes, while the holders let you display two signs at once for added versatility. This Quartet aluminum heavy-duty silver display easel has a collapsible design, providing convenient storing and easy portability.
Display easel is the go-to solution when a dry-erase surface isn't required
Total stand height: 66" for comfortable viewing and presenting
Comes in silver and made of aluminum
Adjustable height from 38" to 66"