What cables would sound best with my system??

I had the Monster M2.4 and in my system the Acoustic Zen Satori( although a bit more expensive) are far superior in all respects. You can usually find a used 8 ft. pair for @ $300.00-$350.00. Good luck evaluating.

The ones that you like the best.

eh, you'll have to try yourself. Yes, the Monster 2.4's are good cables "in the right system!". They are superb with Martin Logan's for some reason.
Others to try for not too much, that are simply super are Acoustic Zen Satori's! This is probably the best sounding cable, especially run "shotgun", for cheap I've ever had in my systems over the years!
Anyway, tinker.
hey what kind of sound are you getting now?..describe.
You can then make other suggestions

I just got the audioquest cobalt bi-wire cables and have listened for a few days now. The sound is transparent, but I'm looking for something a little brighter. Any suggestions??

Try some of the silver cables from Stealth that are in your price range. I've found them to be excellent performers and value too.
Good Listening!