Your regular dishwasher should be fine. Just be conscious of what else is in the dishwasher (ie greasy plates may leave a grease residue on the plastic). The dishwasher, even with other food in it, shouldn't leave anything that will harm your baby. Also, you can be overly "germaphobic" to the point of failing to help your baby develop their immune system - leading to lots of illness or possible allergies (or so is theorized).
You will probably want to use a bottle scrubber to pre-rinse the bottles - otherwise gunk may accumulate on the bottom that the dishwasher may or may not get.
From what I have read, as long a you are on city water or your well water has been tested - there is no reason to sanitize the bottles - the water is clean enough (this wasn't true generations ago, thus the method has stuck around).
State Certified Early Childhood Special Education Teacher
New Mom as of March 2009!