Check reviews on Amazon before making a decision. Many of the reviews provide valuable information about the reliability of a machine, tension sensitivity, etc. You can also look up reviews on
http://www.patternreview.com
I looked at the Brother links you provided. They both look as if they have unusually small harp (throat) sizes, which would make it difficult to fit a quilt under.
I'm not sure, but both machines look as if they have all built-in stitches. You really want the ability to change stitch width and stitch length on all stitches.
These machines would probably be okay for piecing, but maybe not so good for machine quilting or for machine applique (because you want to be able to modify the stitch length/width).
I went on Amazon, did a search on Brother sewing machines, selected the department of "sewing machines", specified between $100 and $200, then ordered the results by average customer review (machine with highest rating is listed first). This is the Brother I came up with:
http://www.amazon.com/Brother-Afford...dp/B000JQM1DE/
I believe I have seen others on the QB mention that they are very happy with this model. It does look as if it has a small harp size, however, and I'm not sure if it has adjustable stitch width and stitch length. Looks as if it has 3 needle positions, which is a nice feature to have.
You may want to check if a machine has the needle-down option. Love that on my machine!