Jarvis, The 10" Dob would be your best option. I got the 8", because it's so cheap and so portable, but once I'm observing I wish I had the 10" or the 12" even. But when I'm loading up the Corolla for a night away under dark skies, I don't miss the 12".
The 10" is probably the best compromise between light gathering power and portability. But if you have the $ and the will, go for the 12", which should keep aperture fever under control for quite a bit longer.
http://www.staroptics.com.au is another dealer (of Saxon type Dobs). BTW, Sirius Optics' Dobs (and the larger Saxon dobs) are more expensive than Andrews' or Bintel's but claim to have pyrex mirrors, which is good if you're impatient. Pyrex has a much lower thermal expansion coefficient than other types of glass, so it won't warp so much while cooling down, so you can observe pretty much as soon as you take the scope outside during a cold night. But once it's been outside for 30 minutes or so, pyrex mirrors should not make any difference.
Either way, what you get for your money these days is truely amazing!