Is the new one the same as the one for 250? what kind of warenty does the shop give on used machines? It also depends on how much in your budget, don't forget to add in the cost of thread (you will need a variety of colors) and stabalizer, do you have matching bobbins already at home? or are you going to need to buy a few more? (the stores are more likely to throw in a few things if you buy new, of course you are already spending more)