Best lower end cables for B&W speakers...?

The wires you're already using are WAYYYY overkill for any speaker no matter how overpriced. Forget wires. Save up for something that actually matters. Like speakers. In fact you could downgrade your wires to 16 ga. zip cord and there would be absolutely no difference in the sound quality.
Unless you, like many others here, imagine there is.
  I brought home a pair of B&W pedestal-mounted small speakers (forgot which model maybe 607?) and hated them. They sounded loud, bright, harsh, with an unlistenable upper-midrange spike in the frequency response. But that's only my opinion so I'm not knocking anyone else's.
  I now have Maggie LRS speakers which are the best thing I ever heard but again, that's just me.

I use Canare 4S11 in both my McIntosh based systems. One system is in the 60K range and the other in the 23K range. I had 3K speaker cables before I went with the Canare. Did you know that 90% of all recording studios use Canare 4S11 cables?

Please feel free to completely disregard everything hombre said as it’s pure rubbish from someone who obviously has limited experience in audio.  I mean, what the hell are “pedestal-mounted” speakers???

Anyway, it’d be helpful if you shared what electronics you’re using, and interconnects can be as or more important than speaker cables so let us know what you’re using there too.

As for speaker cables, there’s a pair of Acoustic Zen Satori cables on US AudioMart for $550 that’d likely make a big improvement.  They have a nice refined but still nicely extended treble but will also help by fleshing out the mid and bass tonal density to further balance out the high frequencies.  The Satoris are excellent and well above “mid-level” cables so you’d be moving up several rungs with them IMHO.  BTW, I’ve owned and used them in my own system (in shotgun bi-wire form) for years and compared them to some other good cables and they remain in place.  If I’m wrong you can just turn around and sell them for little/no loss as there’s a fluid market for used AZ cables. 

While the AZs would be my best recommendation, if you’re hesitant to buy used you can try something like Morrow cables that offer a generous in-home trial period and are also very good cables.  But as I mentioned above, don’t ignore your interconnects as they are critical as well.  Anyway, congrats on the new gear and best of luck. 

Please do not listen to anything cable haters like @hombre said. Pure hatred and BS, pretty sure he does not own any speakers 

I am using Canare 4S11 speaker cables.They replaced an old pair of Straightwire Maestro cables. I think they improved my SQ. Better image and soundstage. I needed a 18' pair. So the cost of a higher level cables would be prohibited. I think they are very good for their inexpensive price.You wouldn't be loosing much if you don't like them.