We got the Westin heavenly bed. It's super great, I think it's like the bowling ball bed. Queen to King you will never go back.
I'm just gonna chime in here that a great bed is an excellent start and the king upgrade is huge, but look at the overall system. Get ST. Geneve sheets made in Montreal. A bloody fortune but an entire bed in this stuff is like a soft billowy cloud. Sheets and pillows make a big difference to comfort, heat levels and deeper sleeps.
http://stgeneve.com
We moved from a queen bed with a memory foam on top, but it was extremely hot.