One problem with not liking your wheeled case is most are not designed for sewing machines. Most rolling carts for clothes or scrapbooking offer no more protection then a cardboard box. All it took was one of my machines to have the spool spindle break off when the cart I was using turned over. It broke from the housing so not repairable. It was not an expensive machine but one I really liked to take to classes. I have the Tutto wheeled case and it's perfect. It protects the machine and rolls freely. There are several options for different weights of machine. If you have an expensive machine or a machine that is irreplaceable or just your favorite, then you why bother with totes that are not made for them? I have found several on ebay and one at an estate sale. Bernina has quality machine cases too.
http://www.tuttocases.com/machineonwheels.html