Its nice to have a treat at the weekend. Dark chocolate is great as part of a low carb lifestyle. I prefer 85% or 90% cocoa as its the lowest in sugar and a little is all you need to ear to get the chocolate satisfaction. Lindt and Green and Blacks are my favourite when I can get my hands on it, but Aldi does a reasonable cheaper one. Goes great with red wine too!
It takes a while to get used to it, so trying with a good quality 70% chocolate would be a good place to start. Once you have weaned yourself off sugar, the standard milk chocolate becomes unpalatable.