Remember when buying a machine at the big box places, while it may have a reputable name to it, many of the machines are made with plastic parts in order to have that low cost.
I recommend going to your local sewing machine sales and repair center. Many times they have models that were traded in that are still in very good condition. Most places will even offer some kind of 30/60/90 day warrenty on the refurbished ones. Also, shop when the new models are coming out. My store usually offers a deal on machines that they are no longer going to carry.
I also recommend using a sewing machine store because many offer classes on how to use your machine and also sewing classes in general.
Good luck on your search for the machine that is perfect for you.
P.S. I have a Pfaff Hobby 1122.
here I love it. I use it for piecing quilt tops. I hand quilt all my quilts.