Should I buy a power amp.

I have a Anthem mrx 540 8k paired w klipsch 8000 f lls and a pair of klipsch 502 s lls. I also have an svs sb 5000 revolution. Im so new to all this and am learning as I go and ive already wasted a few thousand buying the svs soundbase pro w an svs pb 2000 pro and klipsch rp 600m lls which I sold for the anthem and new klipsch speakers and new sub. I feel I just want to buy a power amp bc I love the way they look and think they will make my system sound even better than it does. Hell it sounds great already but I have naive ears bc I haven't heard alot of different speakers at all. My klipsch speakers are very sensitive so ive read that they dont need much power and the anthem is 100w per channel 2 channels driven although ive read its 100w all channels driven at .1% thd. 

    My question is to people who know and have expierenced way more listening, should I invest in a power amp or buy a center channel or both. Idk what to do and im obsessed w these power amps but like I said my system sounds really good to me which ive also heard is all that matters. Any input would be greatly appreciated. Thank you