To please the wife, I'm installing a double sink vanity-replacing a single. I'm also installing a 60" recessed tri-view mirror/med cabinet. As you can imagine, I have to re-route all of the utilities around it: water, electrical, vent and install new drains. I'm wondering if there is any reason that most sink drains seem to exit the wall at a slight angle. I can put mine whereever I want at this point (before drywall). I believe that it would be best to be offset the wall drain by a few inches from the actual sink drain to make it easier to set up a trap. The other question is I am running 1/2" copper and planned on using compression shut-off valves (that's what it had). Is this the preferred valve for copper? By trade I am an idustrial maintennce guy and more of an electrician than a residential plumber. Any thoughts would be appreciated.