My wife and I enjoy staying at the HR Bellevue, and regularly get upgraded to one of their Executive Suites which are quite nice. We've also stayed in one of the Emerald Suites at the Grand Hyatt Seattle, which was definitely on another level from the suites in Bellevue! If you're going to use a DSU, I'd go with the Grand Hyatt.

Unfortunately, I don't have any feedback on the suites at the Olive 8. We've only stayed in their regular rooms before, but we definitely like that property as well.