Your desire sounds so familiar . . . I pretty much did the same thing 7 or 8 years ago, except I kept the Marauder . . .
I wanted to stay with a conventional "long gun" as I was after the accuracy, and I find them much easier to shoot well than bullpups for me. I liked bottle guns, so I decided on a used Daystate Air Ranger. I simply watched the classifieds and within a few months I had it - and I still have it and probably always will. It is my most accurate gun. It is so much more solid and robust than the Marauder. Used is really the best way to go - remember that while there are those of us that don't "churn" through air guns (or other stuff too) there are many that have to have the latest and greatest, and their habits are your financial windfall.
Before I got a Huben K1 in 2021 the Air Ranger was my most used air gun, but not so much now - but even though the Huben is the one I grab the most often, the Air Ranger is the one that stacks the pellets at 50+ yards. If I were doing it now, my choice would be a used Wolverine, as it has some clear upgrades over the Air Ranger that make it even more stable and accurate.
Good luck with your decision.