umm i dont have experience in this subjuect but the best from what ive heard is (mephredone(sp)).but ive read some bad stories of peoples limbs turning blue and crazy shit like that so for the sake of harm reduction i dont recommend it.
My choice is Methylone such as in Lime Fantasy or Mint Mania brands. Nice high but very short, but you can actually sleep after them without too much tachycardia