Even though I don't use it all the time, I love my Accuquilt GO. It was a surprise gift from DH! It's really great on triangle cutting with the dog ears gone so matching is a breeze. I just bought the Drunkard's Path dyes so I am looking forward to trying that out when I clear my current projects. I cut in bulk on my screened porch in fall and spring. I have a table on bed risers with two big Olfa mats out there and cutting is a joy! I keep it covered with some upholstery vinyl between times so DH can set his "mess" on it. He's more than happy to clear out for the week or so I need it in the transitional seasons.
I second the Creative Grids plug for rulers. They are so fantastic. I have just bought the expensive rotary blade sharpener. Tried the hard blue hand held one. SAVE YOUR MONEY THERE! Now my current rotary blade won't go dull so I can try it but if Bonnie Hunter says it works, I'm pretty sure you can bank on it, LOL!
I haven't had much luck with purchased pin cushions but have loved the handmade ones I've found to use. I can't imagine buying pattern weights. Mama used cans, salt shakers, dinnerware knives, etc. so I do as well when needed!
I have put good money into a nice sewing chair and lights and been glad that I did over and over. I also don't mind buying a new sharp seam ripper along since they seem to be such an essential part of my sewing experience but that's telling on myself.