Also, don't forget
WWW.andrewscom.com.au who also sell Celestron, their 4SE is only $799, which is $100 cheaper than the others.
Coming from a skywatcher 5" to a mak 4se would be a bit of a backward step, the target field of view would be narrower and probably significantly dimmer due to the mak having higher secondary obstruction with a smaller aperture as well.
Cheers
Chris