Welcome to the obsession. The only treatment is acquiring 1 to 2 "new" sewing machines per month.
The 201-2 is arguably the apex of straight stitch sewing machines. There's a case to be made for the 301A, but you'll have to get your hands on one and decide for yourself...
One of my personal White Whales is a 1200-1, nothing but a 201-2 in an industrial type table with a Knee Lift!!
What are you looking out for next?