Instead of astrophotography, why don't you try something easier like neurosurgery?
Just a couple generic comments here: get the best mount you can afford. That's more important than the telescope & camera, to begin with. I don't know anything about the Advanced VX, maybe it's good enough.
Figure out your angular sampling in arc-s/pixel with your chosen optics and camera, and aim for about 0.5 to 0.9. Higher leads to undersampling, lower leads to wasted pixels and higher noise. This will also lead to your field of view (FOV), which you can use to see how big typical subjects will look in your images. That can be a surprise.
I like that book -- it will help out a lot. Jerry Lodriguss has a nice intro to AP with a DSLR too.
Do consider software. You'll want an image-gathering thing like APT or Sequence Generator Pro, and image processing like StarTools or PixInsight. Software may drive your hardware decisions.
I have a degree in Phd in nuclear physics and I do AP for the challenge... (actually true)
How much of you list have already purchased?
The mount quality if #1, then there is the mount quality followed by the mount quality! then we can talk about the OTA/camera and other lesser things. I would look at used mounts also since you can find nice used mounts from those getting out of this insanity or going deeper to join us by upgrading.
The AVX is "OK" from what I have read but there seems to be a lot of variation in manufacturing so there are "good" ones and "bad" ones. If I was starting out, I would go for a EQ6 mount instead since you might find a used one. They are good mounts for AP and can run EQMOD which is an AWESOME free ASCOM interface.
They choice of OTAs is a really good place to start. The new SVX80 is a fine scope and it has a good flattener/reducer. It wont be very good for most galaxies accept M31 and M33 or planetary so you are looking at mostly large DSO targets.
You have not mentioned any autoguider or guide scope/camera - that is required for most AP. With the AVX, you will definitely not be doing any unguided AP, so this is a must have.
I use SGP also and I highly recommend it. Very good bang for the buck. It takes some learning, but it is powerful - you get a really good platesolving tool for free for instance. I paid as much for just platesolving a while back.
YOu have not metioned how much LP you have at where you are imaging. That is important since LP will limit what you can do with your camera. Do you have the DSLR or are you looking at buying one? Since DSOs are the best match for your scope, an unmodified DSLR is limited for red and a lot of DSO is Ha so that it an issue. You can either live with it, modify your camera, or if you have not purchased I strongly recommend a cooled AP camera instead. It all depends on your budget. You would have to pay more upfront but for me it is worth it with the low cost of cooled CMOS cameras these days.
I could go on more. these are just my opinions, so that them as just that. You can make AP work with a lot of different equipment, but when I started I got the wrong OTA and the wrong mount with the wrong camera. I got there but it was painful and expensive.