with the INtel Pent 4 chips, in the BIOS, they have an option under Boot,, that is called "intel rapid boot...." something or other, any how, this is standard option with all P4 chips,, this should be ENABLED,, if not it adds about 20-30 secs ONTO the POST!!!
plus reviewing your log,, are you sure that there is not a Driver/IRQ issue or something there,, seems that your NIC and SOUND card are at ODDS with each other,,
they too could be taking time trying to sort out who is the boss,,, has this happened since purchase, or is this a new thing since adding some hardware by chance??
you might want to remove your soundcard from the system via device manager, then reboot and time it again,, possibly the PNP part might also need sorting out,,
Did you not receive any support from Dell's Award Winning Platform ..*cynical snicker*
Just funnin' ,, I have a Dell as well,,, and Did I tell you how helpful their support desk is?? LOL
sounds like you are on the right track,, you have checked out the startup folder too right,,, seems that NAV is also experiencing some issues ,,