Switching to a sit-stand desk is by far the best thing I've done: http://jakeseliger.com/2015/01/24/geekdesk-max-sit-stand-des....
You'll need one with a sit-stand desk anyway so I'd suggest getting one first. You need the monitor higher when standing to have correct posture.
The monitor stands that come bundled with monitors are way too low if stationed on the same tabletop as your keyboard.
Just searching the Internet shows that there are dozens of manufacturers for these things and price ranges vary widely. You should have no problem finding one.
If you're a tall guy like I am, I'd go for the highest one I could find. I have it almost at the highest setting when sitting down and I wish it was higher when standing up.
This one (Ergotron LX Desk Mount LCD Monitor Arm, Tall Pole) has been working well for me for the last couple of years, in conjunction with a Conset sit/stand desk (also great). I got the Tall Pole version just to be on the safe side, and it gives a lot of flexibility on where you want to position and angle the monitor.
Since then, quite a few people have gotten a VariDesk, and if you ask, your boss will just tell you to get one from Amazon.
If you think programming is bad, CAD is even worse. So far as wrist fatigue goes, I was in pain within a few months of getting my first Apple Mac, and quickly learned all of the keyboard shortcuts so I could minimize mouse use. A side benefit is that using a keyboard shortcut instead of an icon doesn't require you to focus your eyes on the screen.
But I told him, "long term computer use will kill you. Get a standing desk."