You should be fine then without Stoneskin it's nice to have for when your doing 4 man dungeons etc. But for end game 90% of the time you will have a fellow WHM along side you so it wont be necessary. Like I said end game raid's if they don't have a WHM and a SCH then they are doing something terribly wrong or just mucking about! :P I've played SCH quite a bit when i first started playing before I move to playing PLD so if you have any questions just ask away. I'll favourite this thread so i can easily find it.