Another benefit of having top status in multiple programs is you can take advantage of whichever chain is having the best promotion at the the time. This winter Hilton's promotion was bunk so most of my stays went to Marriott and Hyatt, for Q1 I'll wait to see which has the best promotion and focus there.

I'll also second the notion to go for something other than Hilton as it is so similar to Marriott. The treatment I get as a Diamond at Hyatt's is far better than at Hilton's and I've heard similar things about SPG.