Don't really feel that 1800 with 100/200 blinds is "healthy"

M is only 6 and if you don't make a move and double up soon, you could be in trouble. Yes, 1800 isn't BAD, but I don't view it as terribly great. A raise to 500-600 would be fine and I'm probably willing to call a push. He most likely would have flat called and you get away from the hand on the flop and make another move in a few hands (once you get a nice PP or Ax). Try and pick up a few blinds and you'll be back in it.