I run both a 92 f250 extended cab long bed 4x4 manual 7.3 idi and an 02 F450 with 12 foot flat bed and 7.3 powerstoke manual. The 02 is my delivery truck and delivers 2 to 5 cords up to 300 mile round trips without any problems. The 92 is my haul truck. I run it every day and load a cord and a half on the bed stacked above the cab and another cord in a trailer. It has 200,000 on it and still runs great and haven't had any major problems. My round trip is 80 miles with 74 rough, steep dirt roads and it has all the power I need without the turbo. I deliver with it and it has no problem doing highway speed pulling 8% grades. If you really want a turbo on a 7.3 IDI you can buy a banks power complete kit for $1200. I paid $2,000 for the 92 and $8,000 for the 02. The Diesels get great mileage, especially compared to my 89 460. I have never had good luck with Dodge or Chevy, others may have. If you want a 350 or larger, a great place to find good deals is truck paper. I have seen quite a bit of powerstrokes in your price range on there.