Congrats dude!!
The Infinity bug hit me too a few years back.
It's like a cult you revisit time to time and slightly less difficult to leave than Scientology.
My last RS5000's blew up on the 1812 Overture back in 1988 and then the foam rotted out so they disappeared.....
I gave up looking for a pr anymore and built mine from decent 1970 Panasonic (Technics) veneer plywood boxes i found at the record store and just because they were such great wood and because the original QB MDF-vinyl boxes rather sucked.
I extensively re-enforced F-B and side to side with 1x1 oak and built a tuneable sealed midrange inside baffle out of 1/4" x 3" cedar slats.
Good thing too because they're sealed and really start resonating when everything's working.
Then plumbed in a Kappa 6 XO, an EMIT,-R a 5 in mid from an Overture 3 and the 10 inch woof from the QB. Love them rubber surrounds!!
Frankly, the Overture mids sound better and more full than any of the Kappa 6 Polydome, Phillips cone from the QB or Peerless domes I tried.
It's great experimenting with different drivers in a good cabinet.
I call them my Rat Infinities because they're pieced together like an old Harley and i would be a skeleton before a pr of RS 1.5's ever luckily showed up.
And it is known they demand a good power supply!!!
I'm no expert but there's a great big gray area about amps, "listed power" and "current power" that is real..
Something happens to amps when Infinities really hit stride... Not like a Klipsch or even a Polk.
These little 4 ohm 3 ways smoked my Pioneer sx-626, 828 and most recently a sx-950. Guilty as charged.
Old Pioneers sound great but old infinities and their "dip" will eat em up at loud levels and dynamics......I have learned this.
Headroom is good.
What DOES work, I found, are Luxman's which have decent PS's have low impedance ratings and I've read here as well that Rotels, NAD's and HK's, though I've never had any of those.
I've even run them on a Yamaha P-2050 built like a tank amp and even at a modest 45wpc it sang all day.
A pretty sterile sound however, compared to a Lux or Pioneer.
This receiver sounds wonderful with the Rats, but I don;t push it too hard with the Jimi or 1812 Overture...Don;t care much to have to repair it too.
The 115 sound almost as good and handles the "dip" well but is working at its limits to do it with only ~ 105wpc @4ohm..
It does have the 3db Luxman headroom though which is great, They say the R117 has 4.5db @ some 400+ watts!!
And a 105(8)/175(4) Denon integrated (I received free from a bar mate) is the loudest and can run all day but gets harsh, even on vinyl, and lacks the Luxman luster and velvet smooth sound.
So yeppers my friend, I salute and empathize with you Slacke, for embracing your Infinity addiction and wish you well in finding the perfect amp to run them
At least within 2-3 tries and swapouts, to make them REALLY sing! !