I've had a concept 2 for a few years now. They are great bits of kit, and even if you buy a second hand one (in reasonable condition) they will last...
My favourite is G&B 85%. It just tastes the nicest IMO, more so than Lindt for example. I normally buy a bar on a Saturday (although not every week)...
The Atkins diet was complete re-written a few years ago and is now totally different to the original, demented (IMO) version. Basically it's now low...
This doesn't sound, or look, like anything a "normal" person would eat. So maybe "looking like Mark" is not particularly natural, or even a good idea...