New amp and speaker question

I have a Yamaha amp with 5 little speakers and a sub (all the same make-yamaha)

All my music,films ect are on my nas and viewed on my 50" plasma via amazon fire tv/kodi.

I am quite sure im not fussed about future upgrades or 4k ect,just wondered if the deal is worth the money with the age of everything,its all in really really good condition and hardly used.
 
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