On my last visit I remember that I really enjoyed the White Rhino from Old Amsterdam Coffeeshop on Amstel Straat and Super Lemon Haze from the GreenHouse Coffeeshop in Waterlooplein. The rest is a total blur covering 10 days. I also remember enjoying a nice Cheese strain, but forgot from where it was.
But honestly, there are alot of good coffeeshops around there, especially in the center and a bit up north.
You shouldn't expect anything more from Amsterdam weed than from good ol' home grown stuff, cause it's basically the same. Growing weed in Holland is still illegal, so coffeeshops stock up from individual growers like you or me. The only difference is, you can strot around town with a joint in your mouth and the cops just smile and wave to you.
PS: You have to buy fries after smoking!!! Best fries are at Sonny's, close to Albert Cuyp Markt.