Tim,
Welcome to ISS.
8" dob is a very good starting scope, you will have many hours of enjoyment. But being as dob you will need to collimate regularly. It's not hard but does take patience and practice.
Two choices in the lower market - chessire or laser. Chessire are cheap and easy, but take a little practice to perfect, but will give good results. Must be done in daylight hours.
In lasers, an Orion Lasermate or similar brand is a good starting point and is very easy to use and learn with. Can be used day or night, but needs care in handling as cheap lasers are prone to loose their own collimation, but usually only a little, so still work pretty well.
Advanced collimation - cats eye, hotech or howie gatter - but they are expensive and can be difficult to use, so my advice and experience says, start with an easy and cheaper one till confident.
Good luck and clear skies.
Rod
