Good find, you're more than 1/2 way there.

Consider installing a double gang box (cover shown)
http://i67.photobucket.com/albums/h3...5/Ncp106-2.jpg

and splitting cable between recepticles. Use GFIs.

Boxes need to be secured.

If just placing one outlet, yes need to break the tab off the hot if using both legs.

great, thanks again mark. you've been a ton of help. i never thought of going with a double gang box