Hdmi (I2s) upgrade

I have a Pangea Premier SE HDMI cable that I use between my transport (Jays cdt2 mk.II) and my DAC ( Holo Audio Spring 2 KTE Edition). Although the cable sounds very good, what other HDMI cable under $500 would give me a noticeable improvement. I was considering the Audioquest Diamond HDMI cable.
Hey there.  I'm actually tried an Audioquest Vodka and was totally unimpressed for sound quality, so I'm not sure that I would try the Diamond.  The problem with Audioquest is they use such a small gauge (it was 30awg on my 2 meter Vodka), so the sound comes across thin and bright.

I know this is stretching your budget ($599), but I would probably go for a Nordost Heimdall 2 HDMI for audio quality (and make sure to burn in for about 250-300 hours).

If you look at usaudiomart, there's a guy selling a 0.6 meter Wireworld Platinum 7 HDMI for $325.  Some people have reported that it's awsome, but I tested the Silver Starlight 7 HDMI and it wasn't the absolute best in audio.  I don't know if the pure solid silver of the Platinum makes any difference, but it uses 2 x 26awg wires for the main HDMI signal conductors which can cause timing issues because the length of those two wires could vary.
Thanks for the input. I will check out the Nordost HDMI cable.
I am also interested in the Revelation Labs Reference HDMI cable. A lot of great reviews in spite of some earlier problems with delivery timing which apparently have been corrected.