I have been doing a lot of galaxy hunting with my 300mm Dob and the 13mm Nagler has become my 'galaxy eyepiece'. I know its a bit pricey but its well worth it for the views. I also use a 20mm superview for nebulae, it is not in the same league as the Nagler but it is much cheaper and produces a 'trasty image. I personally dont use barlows.
hope that helps, cheers Mick
