I don't find boas to be particularly destructive. Especially now, she's not going to be knocking over big cage furniture. In terms of pros/cons, as with any snake a display viv is going to be more work to clean, but boas certainly make better display snakes than balls do, and the babies especially really enjoy climbing. Set up some driftwood or other climbing structures that are heavy and stable enough that they won't fall over and crush her. Do be prepared to make adjustments though; not all standard viv setups work for all boas.

Oh... and make sure to post some pics when you're finished.