Hi Ankit, I have been installing Klipsch from 1998 and have installed all their lineup. The best has always been the RF-7. l, ll, lll and so on..
The pleasure of movie experiencing is crisp and detailed dialogs with enriched surround (preferably Atmos). The XPA-5 Gen 3 comes with a killer Hi-Current SMPS delivering 275W/Channel x 5 @ 8 Ohms. The RP8000 will be driven effortlessly by your beify Amplifier. If you are using a Acoustically transparent screen and you have enough space to accommodate RP8000 behind the screen, then i suggest you go with 3 x RP8000. The screen channel dialog will simply be awesome. When 90% of a movie is dialog I still don't understand why the center speakers are compromised in size?
If you are also looking at seamless surround sound experience then please stick on to one brand and the same series. I will not mix match Reference premier (RP) with reference (R) series. There is so much of timbre sacrifice when doing so. Hope this helps.
Cheers
Gadget Freak