I have no experience with the SRA, but I have heard the HRS and the Grand Prix. The Grand Prix is a very fine product, but nothing that I have experienced comes close the the HRS. I have heard four different systems using the HRS MXR stands and HRS platforms. On two of the systems I listened to electronics on both the HRS and GPA. In my opinion, as well as everyone else that was there, the HRS is a stature way above everything else. After I heard it transform a friend's system from one that I hated into one that I liked, and after I experienced an AB session at another location, I jumped in and purchased many of the HRS products for myself. These products isolate your product as if they were in an incubator from the outside world as well as their own foundation and chassis. I have a double wide system in a burled walnut finish. On top I have a non-suspended (like the Kuzma)Brinkmann Balance table (which I am also very happy with the product, the company and the customer support). There are no other products that I am aware of that look as refined as the MXR stand and that give you the option of either a contemporary (painted finish) or a traditional (wood) appearance. My stand is built exceptionally well and it keeps my all tube analog (six chassis) system tamed. I also have my amps on their stands and my amps have 19 tubes each. This system does an amazing job with all of my melodic tubes. The build quality is exceptional and the customer support has always been there for me whenever I have had any questions. These guys know their product and probably know your components and what works with them as well. This company goes out of its way to make sure that everything exceeds your expectations. Their products are well engineered, well built, well packed and well delivered. You do pay the price, however, as their top of the line products cost several times that of everything else. In my opinion, it is money well spent.
