Hi DJDD,
I concur with what Paul has just said.
When you talk about getting dust on the front lens of the camera, be aware that you will be taking off the lens and using the telescope as the camera lens. Any dust ends up inside the camera. Not on the lens.
I personally would consider the EQ5 as adequate for the type of setup you describe (with a small guidescope). Certainly nothing more though! If you wanted to use a larger telescope or any additional equipment, you would need the EQ6.
People do get great results with the EQ5 but will be pushing thier mount far harder than those with the same setup on an EQ6. You can get away with less but it takes far more careful attention to techniques to get good results. If you get better equipment you can get better results with less frustration. This is always the tradeoff
Have fun,
Doug