Warm, flexible, cheap-ish cables?

For speaker cables I recommend the Canare 4S11 speaker cables.  For around $100.00 you will get a fairly neutral cable that sounds amazing.  I switched from expensive cables to these 5 or so years ago and never looked back.  Break in is long, around 500 hours but everything is there in spades, thunderous bass, smooth midrange and a very delicate treble.  I did a long thread on the cables and breaking them in,   I loved them so much, I use them in both my systems now.  

stereo5:

Previously difficult to source in smaller quantities Canare 4S11G (OFC) is now available @ the following link (45 cents more a foot).

This said, the original 4S11 (which I have) is not very flexible, but I do prefer it sonically to the older versions of Kimber  4VS/4TC I've used in the past.

https://forum.audiogon.com/discussions/canare-4s11-g-now-available

DeKay

I would look at the Morrow Audio cables.  They are relatively inexpensive and I thought were very good for the price. I ended up moving to Shunyata Sigma's, which are outstanding, but significantly more expensive.

Warm, flexible, cheap-ish cables?

Cerious Technologies Graphene Extreme is exactly what you've described.  They're relatively flexible - but not around tight corners.   The later models: Matrix & Luminscape are more detailed. Not what you want.

2 suggestions.  Blue Jeans cable and Pine Tree audio.  You can contact both directly and share your specific needs and they will work with you.  I have both and they’re excellent and within your price range.