Hi texag04,
Just to remove any sense of urgency … the “standard” sales at Select Foam are rotating and never really end … they just change in the details. The Cirrus Luxe is certainly a good choice for those who have tested the Tempurpedic Cloud Luxe and their testing indicates that it’s a good match for them in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences).
The foundation offered by a manufacturer is usually suitable for the mattresses they sell and the one sold by Select Foam is no exception. There are also others that are similar KD foundations (and in some cases have smaller gaps between the slats) in the foundation post here which would also work well.
The bedframe is an important part of the sleeping system and is the part that supports everything else (the foundation, the mattress, and the people on the mattress). I would make sure it has good center support to the floor (with at least two legs) and legs that don’t bend or collapse when you move the bed. Most of the major bedframe manufacturers make steel bedframes that will be fine but in general I would avoid the cheapest versions which can be weaker and not as well constructed. If you (or the mattress) are in a heavier weight range then I would look at more heavy duty frames.
If you plan to use a headboard or footboard I would make sure that it can be easily attached to your bedframe. Some headboards are bolt on and some are use a hook type clip on (which may need an adaptor) and some frames don’t allow for a footboard to be attached if you are considering one.
There is a good video here about choosing a steel bedframe.
Phoenix