Now may be a good time to learn your way around the terminal and UNIX, which will allow you a thousand things no one gui app would do. For searching for files, I usually use the locate utility:
cd /usr/libexec
sudo ./locate.updatedb
after prompting for your password, this constructs the locate database. After which simply type in
locate pattern
where pattern matches a string you want to search for. For example
locate plist | grep -i aperture
returns the pathnames of all plist files (preferences, etc) files on the system belonging to Aperture.