I'd stay away from the HF one, as I think you know they are really hit or miss-what I did (after much research) was to buy one of these:
http://www.yardstore.com/browse.cfm/4,6017.html
Also, they carry used Rivet Guns (I'd stay with 3X)-
http://www.yardstore.com/browse.cfm/4,6281.html
or, you might consider one of these:
http://www.yardstore.com/browse.cfm/4,3874.html
In addition, I use one of these for Rivets that are close to an edge,as I get more control:
http://www.yardstore.com/browse.cfm/4,6337.html