Advice on speaker cables.

Speaker cables are very user/system dependent and are useful in refining the sound you are seeking.

The Mogami cables, mentioned above, are usually neutral and represent good value.

If you are handy with a soldering iron, or use spade lugs with locking screws, a good benchmark is to fabricate some speaker cables using microwave cable (NOTE: not all microwave cable is the same gauge and construction type).  Avoid microwave cable with aluminum/steel center conductors plated with copper.  Use microwave cable with solid copper (solid or stranded conductors) or Silver Plated Copper (SPC) wire.  I prefer the solid center conductor SPC construction though it can sound a bit bright.  Microwave cables typically excel in long runs (good if you want to run the cables under a floor to the speakers) due to the low capacitance and low inductance construction.

Once you are used to the microwave cable sound you could bring in other cables for comparison.  You could do the same with the Mogami cable.

Morrow audio gives a 60 day return..  they’re great in my system suggest level 5 or above

The difference in sound you believe you're hearing isn't real but a bias as there is no objective difference in how cables sound from one to another. 

Speaker cables make a big difference in a high-end system, but one needs to spend over $1,000 on the cables before they start to make a meaningful difference.  I would suggest that you limit your cable spending to the cheaper cables that you are looking at, and save your money for an eventual speaker upgrade.  Kimber gives good value for money spent at the price ranges that you're looking at.