help buying irs beta

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What are your thoughts on integrating a pair of subwoofers with a pair of Ren 90's?

I wouldn't waste my money Mitch. The Ren 90's have a couple of achilles heels. Firstly, the acoustic foam in the transmission line midrange enclosure in most examples is rotting by now & would need replacement. And there are no NOS spare parts any more for these speakers. Also, if the grilles (which are an essential part of the acoustics of the speakers similar to Avalon) are damaged and ill-fitting due to damaged or broken pegs, or a broken frame. Good luck finding a replacement as they are basically non existent. I bought a 2nd hand pair of Ren 90's from a snake in Texas called Larry Schwartz ('lwschwarz' on forums) who sold me a pair with 'textor' repairs and a damaged grill with cigarette burns on the grille cloth. As the grills were unobtanium, I ended up selling the speakers at a heavy loss. Even if you did have a pair in decent shape. Why spend as much on the speakers for a pair of subs when you can just buy a better and much newer pair of speakers?

Good luck trying to replace the sound that the ren 90’s produce for less than 10k in today's market

Yes if you accept all the caveats above, agreed you would be hard-pressed to find a better speaker under $10k.