What is the budget? In the under $1k category I would defnitely go DLP for viewing Xrays, MRI, etc. Their real world contrast is just better. Specs are just marketing fluff as the lumens rating is usually in a poor picture quality mode. Which might not matter if looking at graphs on a power point but for pictures, x-rays, etc. it does. You need a good amount of brightness to deal with your ambient light and DLP will give better contrast in this price range. If you are using a 4:3 source you are probably better going with a 4:3 projector unless you go with a 1920 x 1200 widescreen and have black bars on the side. That owuld work well but would be more money.