Need Ideas on speaker cables

Many choices...  The fact that you have monoblocks also opens a slightly different discussion.  Your amps could be individually located close to your speakers if you have interconnects long enough to accommodate that placement.  This could open up some savings on the speaker cable cost based upon length, though the savings may be consumed by changing to interconnects of adequate quality and length.  It is nice to have options.  

Forgot to mention Silversmith Fedelium cables. A bit over your budget but outstanding cables worth paying up for IMHO.  Read the reviews. 

https://silversmithaudio.com/fidelium-speaker-cable/

If you locate the monoblocks next to the speakers and use very short cables, the influence of the speaker cable is minimized. That may be enough.

Given your setup, I would try a different amp before spending money on wire. The most recent Hypex and Purifi output modules are completely load independent, so you might try one of those and see if that helps the sound when used with your low-impedance speakers. The only review I could find of Red Dragon monos said they were not great at low impedances. Whether that applies to your model or if the manufacturer changed them, I don’t know. 

There is NO speaker cable that will make up for a fundamental mismatch in amplifier and speaker, if that's what you have.

Just a suggestion for you to consider.

Given your system, I would think you would want cables that are on the natural musical side, if so then the best Cardas (used). If your want more detailed the DHLabs. Anti cables have a nice balance.