Ok I just checked and there seems to have been a bit of a price jump in the past few months. Strange considering how much the Aus $ has gone up in comparison to the US.
Check here, you may want to consider a 6"
http://www.andrewscom.com.au/site-co...-guansheng.htm which would still be much better than the 127 Celestron.
As for its good points, well it's plonk and play, no having to set your latitude and find celestial south and align your mount, no having to look through the eyepiece from under that telescope when pointed in some directions, no having to wait 15 sec for the wobbles to settle down when you adjust the focus, No having to worry about meridian flipping and finding the object again.
And the view, no comparison. And that's without the better eyepieces you would get with the dob compared to the Celestron. remember the eyepieces are half the system.