help buying irs beta

Hi ima newbie just trying to break into the real hifi world.i have the opportunity to get the irs beta for a steal.i need some advice on what problems to look for and also wondering if the sunfire 400wpc 7channel amp would be okay for these speakers using 4 of the channels 2 for the upper panel 2 for the woofer towers
I was curious about the comparison between the Ren 90’s and Focus SE’s. The Rens are a demanding load & don’t move as much air, or go as low as the Focus SE’s. Though I was amazed by the sound of the Ren 90’s at their price point, so I can only imagine how much better the IRS Omega and Epsilon sound. They are remarkable speakers. And given the similar cabinet design of the R90’s compared to the S5 Mk2’s (ie: wide, flat front baffle with a curved cabinet), their speed, staging & excellent off-axis response, I thought the S5 Mk2’s were fair game. I don’t know how Magico manage to achieve the stellar speed, staging and off-axis response of the Rens with ’conventional’ drivers, but they do. But overall, the Magicos leave the old Infinities for dead. A side by side comparison with the IRS Epsilons would be interesting though.
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.