I prefer using Bitfinex. I trust the security much moreso than Cryptsy. You don't have problems with deposits and withdrawals either. I recommend all Darkcoin community members to migrate to Bitfinex.
Yes BFX is the great and very pro exchange. They have quick and quality support as well.
+101 for them.
fast but unclear interface and deposits, and will add that when making orders I don't know how much available balance I've got left, so I have to guess or do it on a calculater!
I have had a Bitfinex account for months. Have gone into it 3 or 4 times only to just shake my head in exasperation at how ridiculously difficult it is to understand. Now maybe it's just me and I haven't developed the knowledge yet, but compared to every other exchange I've ever used I can barely make head or tail of it. I've gone into the "How it works" section too but that hasn't enlightened me much either. Is there a video intro or guide (or something....anything!!) that anyone can point to?