Don't understand how this could be Illegal, how any could find that you are selling bitcoins, if you made a deal you just give or take cash to/from person and he transfers you bitcoins, but there bitcoins and cash are not directly associated so there no way to prove that you sold or bought bitcoins? Like you just gave some money to a buddy, and he gave you some bitcoins...
I think anoni deserved to be #1, at least I used it and had no problems but I havent tried all posrt books so I can't say there arent any better than anonibet.