A nice start is something like a newtonian 8" with an f/7 or f/8 speed - that will allow for good camera speed but also be useful for visual.
An EQ5 mount and you have a decent start.
Keep you eyes on the for sale listings.
Most of the stuff that sells is people moving up to the next level and the stuff is well looked after or someone who lost interest and it's unused.
It is seldom worn out.
The Newtonian is light enough but you may have to be an acrobat to look into the eyepiece sometimes if you're doing visual - what sort of DSLR is it?
Canon 1D?
If it has live view and laptop control, you're well on the way.
Are you north or south brisbane?