So....
Looking at doing a Nurgle-themed Chaos Marine force (plague marines as troops, characters with the Mark of Nurgle, as well as daemons, a dread and spawn, and an Obliterator cult because they're fun). Obviously the default option would be to paint them up as generic Deathguard (so, dirty green base coat). However, the off-white/bone and red colour scheme of the Lords of Decay (as presented in Imperial Armour 7: the Siege of Vraks Vol. 3, and a tiny picture of them in the current CSM Codex) really appeals - it strikes me as a fun scheme to paint, it'll look (a little) different from a default Plague Marine army, and there's the potential to jazz it up a little with washes and weathering powders (particularly rust).
What I'm wondering about though is the background of the Lords of Decay - from my research on the internets, it seems that they are a splinter faction of the Deathguard (I'd imagine, in much the same way as Typhus and his followers have made a spit from Mortarion and the main body of the legion), which seems good as assuming any future rules/army list hijinx from GW, it would still (easily) allow use of them in the future if a Legions codex is released (which I doubt).
So, I was hoping that anyone with the knowledge could tell me, do you know any sources for background/information on the Lords of Decay apart from Vraks 3? Is there even much in the way of information about them in that book? And finally (for now, at least), is Vraks 3 worth the asking price (I've read some reviews, but I baulk at the price considering that I'll never own most if not all of the models that the rules relate to)?
Thanks for your time, and may Father Nurgle bless you with magnificent buboes (or not, your choice ).