I found a heating and cooling guy willing to do the install, sent him lots of pictures, measurements etc and we decided on a suburban NT-30SP as our replacement. I ordered it on Amazon for 499.99 plus about 36$ or so extra to rush the shipping and get it here by the 9th.
The new furnace wasn't an exact match for the old one so we had to re-route a water line and drill new holes in the wall for the intake and exhaust.
we put in all new ducting and the new system works like a champ.
here's the before pictures: