Monster or not to Monster
Here is the thing...
Monster makes a very good cable (don't get me wrong)...howerver there are other cables of the same quality of monster for much less (as you have found)...Just to let you know the Dayton Audio can only (for the most part) be bought from Parts Express (it is their own name brand). And Rob made a good point that yes there are lower cost cables, even lower than Parts Express. You have to go with what you feel right about....if you don't feel good about monster now than return them, if you are ok with it than keep them. I support Parts Express, not only because of the selection of items, but their Customer Service is some of the best and with a 45 return policy...you can't go worng. Here is a quote that i found off an article here at Audioholics about speaker cables:
"Interestingly, the New Scientists recently commented on the London Heathrow Hi Fi Show, saying that among the cables selling for up to £30,000 for 6 metres, they found Quad demonstrating their latest speakers to great enthusiasm. The orange cable to the speakers looked oddly familiar. When asked about it, Tony Faulkner, the recording engineer demonstrating them (who'd used the speakers as monitors while recording Saint-Saen's complete works for piano & orchestra, Gramophone's Record of the Year), said of the cables:
"Yes, they would look familiar if you have a garden. Before the show opened we went over the road to the DIY superstore and bought one of those £20 extension leads that Black & Decker sells for electric hedge-cutters. They are made from good, thick copper wire, look nice and sound good to me. The show's been running for three days and no one in the audience has noticed..." - New Scientist Magazine
I hope this helps a little