I used to live in Oakbrook Terrace, and have stayed at all 3 properties (when I didn't live there). Haven't stayed at the RI. I agree w/ the first responder's answers. BTW - OBT is a 2-minute drive from OB.
I wouldn't stay in Bloomingdale unless there's a big price dif. You're there for a wedding (which I was last time I was there). Go for close, convenient, plus if you do have some free time, the OakBrook (outdoor) mall is nice & has some decent restaurants, etc, more so than Bloomingdale.
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Sharon