18 bit

I'm going to be getting an A/D converter in the next week or so. I was going to get the Lucid 2496 but I found an 18-bit Mytek for less. I know the Mytek was really expensive back in the day, how would it compare to a new Lucid or Rosetta? Being 2496 compatible isn't all that important to me right now as I don't have any other gear that can handle it. Good sound is the only consideration.