Go Micro ATX with a decent sized power supply and you won't have that problem. Micro ATX boards are only 2 inches longer than Flex ATX.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>