There is no point to buying a big telescope and mount if you don't have a place to put it.
Backyard Observatories - Club Model 2: 16'x24' on slab with 16'x8' warm room - 11,800$
A good mount makes imaging a pleasure. A bad mount can make imaging frustrating and miserable.
ASA Direct Drive Mount DDM85 Premium: 19,256$
This mount is direct drive, can be used without guiding, and has a payload of 100 kg.
PlaneWave 20 inch CDK Optical Tube Assembly: 32,500$
This f/6.8 telescope has a 52mm image circle that is flat, astigmatism and coma free. It weighs in at 64kg, well under the mounts capacity.
SBIG STX-16803 and FW7-STX Filter Wheel - 11,590$
Off Axis Guider:
Astrodon MMOAG - 825$
Money Spent = 75973$
That leaves about 24,000$ for such minor items as pouring the slab, running electric, filters, automating the roof, and all the myriad other expenses.