I would go with the FW. I have many machines. My little FW only does straight stitch but she'll sew on fabrics that the fancy ones yell about. Also picking out a machine that suites your wife would be best left to her.
There my be features that she wants & hasn't said anything about. You could make a "gift certificate" on your computer that says what you've been looking at, etc. I can tell you that if my husband picked out one of the newer, fancy machines for me I would appreciate the thought but I would not be happy if he actually bought it.
Good luck