i wonder if thats almost enough for a 150mm dob...
yup, over at
www.andrewscom.com.au you can get a 150mm dobsonian reflector for $349 plus postage. 150mm of aperture will stomp all over 105mm
the scope is a guan sheng gs580. go have a look and see if you like it
dont be put off by the mount, dobs are way easier to operate than an eqatorial mount for beginners