As a blood DK, we make almost zero use of haste. We can however make use of every point on the tank cloak. Str and Bonus armor are approximately equal for Attack Power calculations. Supposing we're going Breath of Sindragosa, I'll make use of the extra multistrike.
So you're not losing strength. You'll in fact make up for the "loss" with the 116 bonus armor. Remember 1 point of bonus armor = 1 attack power just like 1 point of str = 1 attack power. Attack power increases Death Strike healing as well. So, no, I wouldn't say it's far better.