To save.... or to indulge...

I am stuck with an awful quandry. I have been lusting after a standard flyer assembly for my Ashford Traddy double drive for over a year now. The bobbins change faster, the other kits are less expensive to buy, and the standard bobbins are cheaper (should I decide to buy more of them rather than keep the DD bobbins I already have. The other side is that this is money I would otherwise be putting toward my down payment for a condo around here. I need $15K give or take. Do I use some of that extra paycheck coming up next month or stash all of it in savings? Please, help me make up my mind!!!!