if you haven't chosen yet, consider the MC8900.
the extension table is included with the standard accessories.
that's a "must have" (for me, anyway).
i think the extension table sells separately for around $99.
whichever model you choose, you will also want to buy the 1/4" and open toe accufeed feet.
piecing, attaching binding, sewing the binding down, and straight-line quilting become a breeze.