Advice/Recomondation on Infinity speakers

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Good day Group,

Can you guys please advise on the following:
I want to setup a second surround sound system but I want to use my existing Infinity Reference 21i speakers as the fronts, bearing in mind I don't want to break the bank.
What center speaker and back speakers are recommended.
What amp, opinion on the Yamaha RX-V765.
What sub, opinion on the Polk DSW PRO550 wi.

If anybody has any equipment that might be suitable that they want to get rid of please pm me.

Regards

 

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[adie]

 

[Atjan]

 

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[King_Julian_S]

 

[Family_Dog]

 

[Andre Vermeulen]

 

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