Mouse accuracy

Good evening,

I have a problem. Every mouse/trackpad I have used/owned on a Mac (iBook, MacMini, MacbookPro, etc.) is non-accurate, or imprecise if you prefer.

Example. In the capture I provide, i select the Dictionary. Then, I select the App below the Dictionary (1x click), which happens to be Firefox. It will either:

-Launch Firefox. Only one click. ? I just want to select it, not launch it.
-Launch the Dictionary, whereas I clicked on Firefox. (1x)
-Sometimes, it will do what it is supposed to do, select the Firefox line in blue, without launching it.

Now, when browsing the finder, that can be very annoying, and makes one loose time closing the apps he/she accidentally opened.

Anyone else expriencing this problem?

Note: this happened a lot with the iBook's trackpad, and a BIT less with the wireless Mighty Mouse. Is it Apple Hardware that is shiat? Should I look into Logitech? Are there any settings to change?