A few comments:
1] A warrior with "400 dodge" will also have dodge from defense and agility, meaning the DR will be higher than what you suggest. On my warrior I have 392 dodge, 540 def and 135 agi- and yet 100 dodge rating converts to only 1.83% dodge.
2] I don't see the budget cost of dodge rating on that page. What I do see however is the budget cost of defense. For 1 block value I need to spend 0.65 item budget, for 1 defense rating I need to spend 1.2 item budget. In 3.2 the block would cost 0.325 item budget.
Now as I said, I dont know the cost of dodge since it goes without mention on that page. Instead I'll use the value of defense, as gems and gear seems to suggest they cost atleast roughly the same.
To get 100 def I need to spend 120 item budget. For that 120 item budget, I could get 369 block value.
Now then if I take your results and calculate them according to those values, I get:
By all means though, correct me if/where I'm wrong. Also my warrior is just about naxx geared, your 55% avoidance warrior will most likely get hit by DR more heavily than my warrior.
 Perhaps it's worth while comparing to parry aswell:
On *my* warrior (Naxx geared), 100 parry gives me 1.34% avoidance. 1.34% avoidance would have reduced my damage taken by 26800. Any Ulduar geared warrior probably has more parry than me, and in terms of item budget block value might actually be more beneficial than parry rating after adding the DR an ulduar tank would be at.