OK i looked for your board and yes it does suppport ECC. So you could go with either one I guess, I recommend non-ECC.
ECC means Error Check Code, it has 8 extra bits to detect errors when stored information is sent back to the application. Since errors don't happen very often in this day and age much anymore, you might as well stick with non-ECC, because ECC slows you PC down by approximatly 3%.