Yes! it is possible. I am also using all of three. but all of these will give you different site statistics.
No technical problems to integrate all 3 or special knowledge required ? Which one gives the most amount of unique visitors ? What site statistics will vary the most among the 3 ?
Google Analytics and StatCounter use the same type of technology. You have to add a piece of code in each page of your web site and, when this code is executed, it increments stats counters. I wouldn't use both GA and StatCounter on the same page. AWStats does not change your pages. It is a background process that is executed at night on your web server. It provides some stats that the other tools cannot report. IMHO, best choice = GA + AWStats or StatCounter + AWStats Jean-Luc