I would save my Disney Rewards and join Landry's Select Club. It's a one-time $25 fee. Landry's has three restaurants in WDW - T-Rex, Rainforest Cafe and Yak and Yeti. Here's the info from their website:
After purchasing a membership, register your account and receive a $25 WELCOME REWARD*
Get a free $25 BIRTHDAY REWARD** to use during your Birthday Month!
* Welcome Reward benefit not applicable for accounts where $25 enrollment fee waived.
** Birthday Rewards cannot be used on the same visit as a Welcome Reward.
+1 on Landry's! It's basically free money. You get points whenever you eat at T-Rex, Rainforest Cafe, or Yak & Yeti's. The $25 welcome gift cancels out the cost of joining, and we've gotten hundreds of dollars in rewards cash.
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