I use the Freud set Home Depot carries, 8" stack and shims costing around $100, depending on your location. I have not used any Harbor Frieght or Forrest dado stacks. Stay away from the "WOBBLE" dado's! Freud also makes a comperable Dado stack to the Forrest for around $200.
Depending up on the type of wood and amount of dado's your going to make is going to drive your purchase. Being new to woodworking I will assume you will be working with less expensive wood until you refine your skills and feel comfortable cutting into a stick of wood that cost a weeks pay. No use wasting a $200 stack practicing, get a cheaper one, then move up to the expensive one.
I mostly use the router table for dado's these days, unless it's in large sheet good panels. It's just easer and safer IMO.
John E. Adams<br /><a href=\"http://www.woodys-workshop.com\" target=\"_blank\">www.woodys-workshop.com</a>