A lot of people here have made a few good suggestions. For me the main one would be to keep the Mach 1. It can be used for wide field and it can be used for visual if you feel like going down that path for shorter viewing sessions (if visual interests you). It is also the most difficult piece of kit you have to replace. If you're feeling disgruntled with astronomy as a hobby in general at the moment (more so astrophotography) it could be good to see how you feel at the end of this up and coming winter period.
I know myself I go into an astro hiatus over the summer period due to astronomical darkness not hitting until I should be in bed and twilight again beginning around the time i should be getting up to go to work. November - Feb is also my busiest time of year at work so apart from occasionally sneaking in a bit of rare occasional visual I don't do anything astro for a solid few months but I do try to make up for it in Winter.
If after this Winter period you're still not feeling it anymore, selling everything but the Mach 1 could be a good idea. If after another year or two you still don't find yourself missing it or using it at all, then maybe it'll be time to go. Come January I do personally start getting a bit disgruntled myself as I don't have any time to get out and do anything at night but that'll all start changing around now until October/November when I'll go through this again.
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