I can recommend the Cardas cable for HD800. To be honest I know bugger all about audiophonics except what I like and I listen to classical music exclusively. When I bought an Ak100 when they first came out and wanted a neutral reference type Can the guy in the audio shop recommended HD800 which had also been recommended by David Mahler in these forums. The guy in the shop suggested an ALO Mk2 I think headphone map for the HD800 served by the Ak100 and replacing the Senn cables with Cardas cables. I only listened once to the the Hd with original cable and then with the cardas which was a vast improvement. I like treble but not shrill harsh treble like AKG delivers. I am happy with the current set up except for the AK which I think has a terrible UI and such a ****ty battery life. So Cardas cables I like except they seem to twist into impossible positions compared to barided cables I ahev supplied with some other IEMS. I think the combo HD800 and Cardas and AK100 and ALO are giving me an audio sound closets to the concert hall reality. I find the Noble 6 IEMs I have subsequently acquired give a similar listening experience perhaps not as wide a soundstage but close.
I really dont want to hear more than I would in a normal concert hall. I see no point in listening to artificial sound.
Hope this helps in ur chopice of cable for HD800
Sorry, I can't say I've heard much of the Hugo. I briefly gave it a shot with my CIEMs at a meet earlier this year but didn't have HD 800s on hand or in the room for that matter (SoCal was dominated by Audeze headphones on every table). If you have both the Hugo and the AK240 in pocket, maybe that's something you can report back on for everyone's knowledge.
Synergy with the HD 800 is tough and expensive to nail, I've mostly settled for "good enough" as opposed to exploring the very high-end options. I've heard the HD 800 sound better out of standalone desktop setups, but the AK240 does a pretty decent job that gets me most of the way there and doesn't leave me really wanting in any way. I will say if you use a stock HD 800 the treble might be a bit fatiguing, particularly on recordings that are prone to sound shrill and hot. Some people have zero problems with it, but treble tuning has been my pain point and primary reason for not liking a ton of headphones/IEMs out there.