you wont see a difference between 1.1 and 1.4. Unless...you like to benchmark you systems Or, for that matter, if you want bragging rights...the 1.4 is the way to go
If you want the 1.4, but don't really want to spend the $$, overclock that 1.1...you oughta be able to reach somewhere around 1.3-1.4 w/o too much hassle.
-eric