Digital cable...

I like the Oyaide DB-510(bnc) or DR-510 (rca). They take a while to break in and can sound strange for a couple of weeks. After having used many digital cables over the years this my favorite.
Remember, if you buy one, no serious listening for a couple weeks.
This cable is in your range new but you may be able to find one used for even less.

Cardas Audio's Neutral Reference Digital since you already like the Cardas brand.
314.00 new , so used would fit in your price range. Plus. the cable would already be broken-in.

The price I quoted for a new Cardas Audio's Neutral Reference Digital $314.00 is for a 1 meter pair. $236.00 for .5 meter.

Check out the Blackcat Silverstar 75

$150 and has a good story.

I have used the Kimber Illuminati D60 previously and it is indeed an excellent cable. Do get only the 0.5m length for best sonics and value.