I have a nag mp-200 and I am continually stunned by how amazing it sounds... I've had it for coming up on a year now and it remains outstanding (even more now that it's broken-in).
My plan was always to start with the mp-200 so I could save a little money by using my Technics 1500's on-board phonostage (which is actually pretty decent). I always thought when it was time to replace the cart, I'd upgrade to a tube phonostage that could handle a LOMC cart and get a Hana. HOWEVER, the mp-200 sounds so good, I'm STRONGLY considering keeping my system as is and just upgrading to the MP-500. I might be Nagaoka for life...