@jdlbt I started with astrophotography about a year ago with the 135mm lens and made ~150 pictures of the Orion Nebula which I stacked in Siril. The reason I want to use a telescope is that with my current setup the Orion Nebula is only around 300x300 pixels.
The scopes you suggest are quite expensive, wouldn't just buying a telescope with goto and autoguiding yield bigger and better pictures? Especially Maksutov telescopes seem cheap and have a large focal length and aperture.