Normal engine temperatures on 6.0 liter power stroke?

Does anyone know what the normal range of engine temps is while driving 75 mph down the highway (unloaded)for a 6.0 liter. I have a 2003 Excursion with the 6.0 liter and the Banks 6 gun / pda. The Pda displays the engine temp and it seems to run in the low 190's while going down the highway. The other day I looked down and the engine temp was at 206 degrees and holding steady (this was the hottest day of the year and the outside air temp was 100 degrees.) I was just wondering if something was failing or if this is a warning that something may fail or if this is still considered within normal limits. I run the Banks on 3 or 4 (out of 6), and have also added an intake and 4" exhaust.  Any information would be appreciated. Tim