Hello Stephanie,
There were two versions of the Polaroid 250 Automatic. One has a little better eye relief on the rangefinder than the other, though essentially they work the same. I have a 250 Automatic that I bought several years ago, with nearly every accessory, and it works great. Whatever battery you fit might end up being a lifetime battery, because these cameras use little battery power to operate. The close-up kit is a nice accessory to get, since you can get much tighter crops on people images by it allowing you to stand much closer to your subject. If you have a regular PC type flash sync cord, that will work in the Polaroid sync, just not with TTL control. The 350, 360 and 450 Automatic are similar, though use a different flash system.
Overall these are lots of fun, and allow you to learn a discipline of carefully selecting shots. This is excellent training for large format. I looked into Littmann and Razzle too, though decided I could do much better; so I am making my own ultra slim conversion with a four way movement adjustable front lens standard. This is possible because I have access to a milling machine and use to make custom parts for roadracing motorcycles; in other words, I don't really suggest trying to convert your own, even though it is possible. If you do get a Polaroid 250 Automatic, you might find that is more than enough; for the price you could always get another and load it with different film.
Ciao!
Gordon Moat Photography