Recommendations for cables based on components


I'm looking for some advice.
I'm currently using a Luxman 505UxII  amp with Harbeth SHL5 XD speakers and recently acquired a pair of Dynaudio Heritage Specials. I'm using a set of cables from Amaz.. GearIT 14AWG Premium Heavy Duty Braided Speaker Wire Cable (25 Feet) Dual Gold Plated Banana Plug Tips - In-Wall CL2 - Oxygen-Free Copper (OFC) Black $23.
Any recommendations out there for upgrading these cables keeping costs in line with current equipment?   I really  am at a loss on budgeting for these and am thinking < $500. Would cables costing $300-500 for example have any improvement over my $23 ones? I do need 20-25 feet though due to room set up. Thanks  so much.
maholl50

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