Freddy,
I believe you've seen ours, it's a cannon IR2525, bought it 5 years ago 200K copies and still going strong. We got it at the store directly across from the Thani Road entrance to the bus station. And they have many. Lazada also has some models that may meet your needs. You're welcome to stop by and check it out.
I would recommend just going with a high end BW copier as that takes care of most of what is needed. We supplement with a basic color printer/copier/scanner.