You are right there are very few out there, and you have hit the right ones. It all depends on what you are using the scanner for. If just B&W docs, of of the Epson models I think is a pretty cheap one consdering. It wight work for just documents. Just a warning O have not heard good things about it. If doing like photo repro, you will have to get one of the $2000 models.
I am in the same boat for an 11x17 printer. Only a few models and we're in the $6,000-$8,000 bracket for all of them.
Depending on what you are doing, you might condsider a regular scanner and stitching software, but the results are never good.