A Great Linux file finder?

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http://www.linuxquestions.org – I'm looking for a good linux file and application finder (prefer a file finder but I know some apps search both files AND apps. I've had a VERY hard time finding something that does this. Preferred usage: launch GUI finder >start typing filename or words within the file >hit return >be presented with a list of possible results that I can then open the result. The BEST that I've found so far is Synapse (https://launchpad.net/synapse-project -last updated 2012-03-18) -technically a file LAUNCHER, but also finds files quite well). I've also tried an app many are familiar with, Gno (HowTos)