>>4041829something like a skywatcher 150pds reflector is frequently uses for imaging. 130pds too.
The issue is getting a mount for it that is good for imaging. If you want to save money you would want a smaller mount without goto, but then you would have to buy a new, bigger mount with goto if you want to get into imaging. You see the problem.
If you want a scope that is easier to transport and more handy than an 8 inch dob, consider a 6 inch collapsable like the 150p heritage from sykwatcher. This one is even less suited for imaging as the plastic focuser can't carry a DSLR, but its very compact and doesn't weight much.