doesn't your Viking have an even feed foot already? That drops down and hooks behind whatever foot you are using?
Mine does and it is more than sufficient for even feeding the quilts I've quilted.
Make yourself and little 20X20 practice sample with the type of patchwork/batting/backing you intend to use and work with that.
I'm not a big fan of generic feet, or spending money unnecessarily. Welcome to the board, come back often.