The Craftsy class from Leah Day on uses a Janome machine but you will find a lot of YouTube vids of hers too which is much cheaper. I started quilting a seven foot five inch square on a Designer 1 but the throat was too small and I swapped for a Pfaff Quilter which was just a little bigger throat. Even the biggest of quilts can be done - I just got sick of walking around my machine to pull the quilt through on the D1. I've since bought a Sweet 16 sit down, but didn't really need it - just wanted it lol It will come in very handy in years to come as I just adore quilting despite being a beginner. It's the best part of making a quilt I reckon now.