Another gearhead in the fold! Welcome!

I like Westcott's analogy and let's be honest, with the stable you've got, you can afford a better budget. I realize everyone weighs their priorities differently, but if you've gone to the trouble of building a dedicated room, you should invest accordingly. Great speakers will give you enjoyment far beyond the 5-7 years you are expecting. The speakers I'm listening to right now were purchased in the '80's for $2K and they are still going strong. True, $2K isn't pocket change for a pair of speakers, but on a cost per year basis, it's safe to say the return on investment has been exceptional.

The most important thing you can do at this point is to audition as many speakers as you can find. These B Tech brackets will hold just about any monitor you can find, so mounting isn't a problem. Brands you might want to consider include B&W, Paradigm, Energy, Monitor Audio, Von Schweikert, Vienna, Epos, and Focal. Some are easier to find than others and all have their strengths and weeknesses. You simply need to decide what sounds best to you. Most dedicate a majority of their budget to the front stage, meaning the mains and cc. In HT, there simply isn't a lot of surround information. However, if you plan on multi-channel hi-rez audio, you might want to allocate more funds for the surrounds as well. To drive them, Denon, Pioneer, Onkyo, and Yamaha are the brands usually bandied about. Rotel, Cambridge Audio, NAD, and ARCAM provide alternatives the usual Japanese stuff.

Hope this helps.