Look at the FINCEN statement regarding miners:
http://www.fincen.gov/news_room/rp/rulings/html/FIN-2014-R001.htmlI've got a clarification request in to them right now regarding "purchasing" = "mining" and "one person" vs. "person".
I'd let a lawyer or FINCEN have the final say, but it reads as though it doesn't matter if you mine the coins or purchase them, you can sell them for cash as long as you keep the cash and use it yourself. But who knows for sure what they mean regarding receiving cash from one person and providing value to person.
Also, the $1,000 amount is an exception amount for not having to file as a MSB.
Finally, NY has their own regs to deal with on top of FINCEN. I have no clue about them.
Epilogue: It sounds like folks have still got in trouble for swapping bitcoins for cash, so I don't think anyone really knows what's going on.