What's wrong with this picture?
Is your church looking to spend money just for the heck of it?
Yes the machine you pictured is old and obsolete, but I bet it works like a charm!
There are so many of these vintage(never say old) machines in situations just like your church's. They are used rarely and are cared for meticulously by gentle men and women who care about things that belong to them.
That Hubbell booster down below is still viable as they still have parts available for it. In fact, most Friendly's restaurants use the same style boosters!
If you replaced that machine, you would be getting something that fits in the same foot print as there are industry standards throughout the world for commercial dishwashers. You could keep your current tables on each side or have them cut down and they would fit right into a new machine.
Don't swap it out for an undercounter machine as it will not have the capacity the upright one has and you would be doing alot of bending and lifting if you had to wash dishes for a cuole of hundred people at a time.
I would still say keep what you have until it absolutley needs the last rites and then just get a nice AM15 or similar machine.
If you decide to purchase a used one, Please, Please make sure you call the manufacturer and find out if is a current production unit and if parts are available for it and for how long they will be available. Also make sure you get a unit that matches the electrical capabilities of the build it will be in.
Hope this helps.