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im going to make the assumption its for purely visual use...
a newt will always be superior for visual use when it comes to deep sky work, collimation isnt difficult at all and once you know what your doing it only takes a couple minutes, sometimes even less.
some people complain about the lack of contrast of a standard GSO dob but if you spend an extra $50 to flock or re-paint and baffle the inside of the tube you will notice a *huge* improvement, good quality eyepieces make a world of difference too. small modifications can be key to getting the most out of your equipment.
for the price of a 5" apo and mount to put it on you could have a flocked/baffled 12" dob with argo navis which in my opinion a 5" anything wont stand up to for visual use deep sky or planetary. even if you imported the chinese one for ~$1000, add the price of a mount.
dont get me wrong i do like the views through a refractor but i'll always drag out the dob for the majority of my visual observing.
8" dob flocked/baffled with Argo Navis ~$1300
12" dob flocked/baffled with Argo Navis ~$1700
8" sct ota only ~$1500
5" chinese apo + HEQ5 ~$2000
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