The extra .5 multi will not increase your daily settings unless you are:
#1 Limited by your FSB/memory
#2 Have subzero cooling
Realistically, on air or water these chips are identical. When it comes to benching and subzero stuff the .5 can make a difference though.
EDIT: The most you can expect with either chip will be in the 4.1-4.4 range (and 4.4 is kinda high, more like 4.3). Save the money and get the E8400.