Tattoo Palace & Body Piercing @ Reguliersdwaarstraat 91 (0)20 638 4448 located very close to the Muntplein, does some very professional and excellent work. Give them a try. Peace.
Damn, I used to work as a bodypiercer for 3 years back in Finland... May be I should try to find a second job in a studio... hmmmm.....
Bodycult on Reguliersbreesraat (next street over from Tattoo Palace). This is the street between Muntplein and Rembrandtplein. They open until 10. That's where I got mine done and I'd reccomend them.