If you don't have a Janome dealer, do you have an Elna one? They are twins. It takes a bit to work out the model numbers (have to compare specs), but that might be an option (Elna runs about 6 months or so behind Janome on a model release, though).
BTW, do please test drive the sit downs (as many different ones as you can). A Sweet Sixteen uses a puck device as a stitch regulator and I have seen dealers have trouble demoing it at quilt shows. Innova uses sensors built into the bed of the table (Bernina might as well). Innova will be more expensive, but having test driven pretty much all but the Bernina Q20, to me it is worth the extra.
But it doesn't matter what I think - it's which machine you bond with.
Michelle