Thanks, I've found the 450C at a really good price (479eur) and as you can see in the pictures above, my tv stand is kinda suited for it, don't you think? Although I'll be having a Surface Pro laptop, 1 Hard Disk, a PlayStation 4 and controllers/vr there, I believe it will be suited nicely.
I'll be waaay ahead of my budget considering the RP series for the floorstanding speakers. Nevertheless, the Rear and Center Speakers will be the RP.
My main concern now is whether I should go with the R-26FA (6" + Atmos) or the R-28F (8" non Atmos). I've found the R26FA for 1300eur while the R28F for 660 (half price).
Therefore, the main question is if they're worth that kind of money or go safe with the old 8" beasts?
One more thing. What stands would you suggest for the rear speakers? Or wall mount?
Finally, thanks for the warm welcome everyone.