I use snaps on my armour. It's the best thing since sliced bread!
I followed TK409's idea of mounting them on plastic and not directly to the armour. The female part is also stitched to the vest so if I decide to use a different method or upgrade at any point it is easily removeable.
As for my chest display...ELECTRICAL TAPE!! And lots of it! It's strong and durable, but it doesn't damage the board, nor is it permanent, which again means if I upgrade my armour - which I plan to do - I can easily remove the board and reinstall it on a new set.
Dan