I'm looking to buy a letter folder. I was looking at the ones that do them singlely, that you feed each one (does up to 3 sheets at a time) at a time. They sell for around $150 at most office supply stores. However, I am now thinking more of a long term, and looking at the larger models like the ones that do several automatically. They hold about 100 sheets or so, and do about 4000 an hour. These ones are about $250. Does anyone have any input on these? Any help is appreciated.