I have not been a part of this scene since silk road(I guess silk road 1 now) was shut down. I was reviewing the list of vendors and almost every one has a damn warning now. Is there a reliable market anymore? Oh for the days where you just had to worry about the vendor not the damn market.
That's really funny coming from an SR1 user...
I recommend Evolution, Agora, BSM, and C9 as generally reliable. Of course, even the best markets have issues sometimes (Agora's recent downtime). I recommend that you compare them for yourself for features and reliability.
BlueSky/BSM has been recommended in the past for novices/first-timers.