Multi-monitor and display location

So I bought a second monitor today. I have minor problem which is that I need to align the two monitor so that when I move mouse from one monitor to another, it will continue physically on the save level or if I have a window expanding between the two monitors. Now, I know I can adjust this from Screen resolution when I right click desktop. The problem is that I want to be able to change it pixel precise. It's impossible for me to align them with free hand.

So I was wondering if anyone knew a software which would allow me to change display position by pixel precision.

Having two identical monitors is usually the easiest answer.  After that it would be having two that are the same size.  After that, determine if you want bottom or top aligned, and use the graphics driver to accomplish.  Not sure if it gets it pixel perfect, but should be pretty close, I would think.

I may have not been clear enough. What I want shouldn't be difficult, it's just difficult because I can't adjust the display height/position pixel by pixel but instead by dragging one display with mouse. My second monitor is currently in portair mode anyways. Here: http://i.imgur.com/bAspT9E.png I just want to move display 1 up or down so that when I move mouse from one display to another, the cursor will stay on the same level on the other monitor when I look at the two screens.

What I'm asking should be possible, if not pixel perfect then at least very closely aligned.