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
If I were in your shoes I wouldn’t think twice about ordering a pair of 25’ foot Canare "star quad" 4S11 speaker cables with your choice of connectors from Blue Jean Cables for a total of $164 plus shipping.

They are entirely adequate.

And although it is getting old to bring up, there is a good chance the music you are listening to was originally recorded at the studio using this wire.
Why 25 feet OP what’s the deal? 3 meters is a push 2 is better. Is there any way you can move things? It’s just too long for a better solution all around. Higher quality cables, and shorter for a much better SQ, dollar for dollar..

I dare say if you just shorten the cables you already have and get them off the floor, you would start noticing a change.. Just sayin'

Regards
I recently upgraded from cables in the $50-$70 range to cables in the $600-$800 range for my system. It made a big difference in my system. Before I committed to purchasing the cables I used the Cable Company’s lending library option. It allowed me to try a couple brands in that range before ordering them. DH Labs Silver Sonic speaker cable is available in custom lengths. A pair of 25’ speaker cables is $550 on that website. I tried that cable and it was an improvement over the what I had been using. 

I suggest trying a few brands from their lending library. It will at least let you hear if there is a difference to you.
How does the Harbeth SHL5 XD compare to the Dynaudio Heritage Specials? Both good speakers I believe.