I bought a singer at the exchange for 89.95 that does everything and has the walker foot. Have sewn sumbrella 7 layers with no problem. Also have sewn window plastic and doubled over webbing. I made all the cushions and canvas on the boat. And i didn't knew how to sew.
I am sure that the sailrite machine is of a higher quality but unless you are going to make a business out of it I personally think it's over kill.