I can’t be of much help beyond the excellent advice you received already, but I bought my machine towards the end of last year and went through a very similar thought process to you - importantly, along with the budget creep.
I initially thought I wanted the Mara X but was also considering the Bianca, it’s a superior machine and I knew if I bought that any thoughts of upgrading in a year or two wouldn’t arise.
But there was a Vesuvius offer direct from ACS at the time which meant that I could order one of those for a very similar price to the Bianca. I chose the Vesuvius and unsurprisingly have no regrets. I’ve had it 4 months and have already forgotten about the cost. Sometimes budget creep is no bad thing if it avoids future regrets. I took the view that buying once was better than buying twice.