I agree with the others. Don't get a generic. With the amount of usage you are going to get from your foot, it's a wise investment. I have a viking and my favorite is the one with the flange. Having said that, getting the 1/4" foot for your machine may not produce a perfect 1/4" seam and you may still have to finagle it a bit, as the thickness of your thread and fabric can affect it. You don't really measure the seam, you measure the resultant patch. If I change threads or fabric types, I check the seam allowance at the start of my project and make a needle position adjustment if necessary. Here's how I check:
http://www.quiltingboard.com/tutoria...ce-t89997.html