Steph... I've just found out my Walkman's ( ZX1/F887) pair with the new Chord Hugo.... I know the DAC in the Hugo will supersede anything that AK240 offers & Chord is renowned for their hi-fi quality.
I should have a answer back from my contact regarding the AK120 when I do I'll ask what I can get AK240's for (it might be too early for them to answer)... at present I kinda fail to see what benefit the AK240 has apart from more memory, I can get 3tb of memory for about £180 & stream it via my ZX1 to the Hugo... for short trips I'll only use ZX1 (shopping), longer ones I'll take the combo ZX1/Hugo.
As a package the ZX1 (or other DAP) paired with the Hugo will represent a way better package than the AK240, based on my needs.
Hardrive : http://www.eastwoodsoundandvision.com/g-technology-gdrive-3tb#fo_c=183&fo_k=4669466541db7418664df2765e032e7a&fo_s=gplauk