interconnect upgrade Question

So I am a simple man. Manley labs Jumbo Shrimp paired with the wonderful mahi's. To round it all off is Music Hall's MMf-7. Oh ya Zu Audio Soul Super-fly... I have the top of the line speaker cable from ZU, my interconnects are all hand me downs. So I want to replace them all with out spending a ton of cash.. I would love some ideas...... Thanks!!