I am working on a plan of attack, trying to be realistic on current and future endeavors.
Priority one is to get an official daily driver:
The 3500 is my first choice at this point, but it will take a few rounds of work to make it up to the task. It needs all new glow plugs, the block heater isn't functioning, the crossover exhaust pipe will need to be replaced, front brakes, shocks, and wheel bearings are toast. The bed is barely mounted to the truck, I bought the rebuild parts, it also needs two fenders (probably inners too), and the cab corners are going, going, gone. I would tackle the block heater and easy glow plugs first, then the front end would be done all together. The exhaust crossover pipe will need the exhaust manifolds removed, same with the two worst glow plugs, I figure all this would be done in conjunction with the fender replacement. I am also going to replace the brake lines with all new stainless ones in the front, the rear is fine as it was rebuilt with nicop recently. The bed and the cab corners are for when I have a dependable secondary vehicle as I really do not need to haul anything heavy in the bed. I would also have to add a brake controller and wiring for my trailers. Other things would be stereo and speakers, keyless entry repaired, and replace driver's side window (scratched very badly) and the windshield due to pits and probable leaks.
Second choice is the Volvo, it will not have all wheel drive to start with and that is my hangup on it, I am going to try and get it functioning with just front wheel drive and see if there are any other major issues, it will need a new pump for the all wheel drive at a minimum, then needs exhaust work and a set of four new tires. These are the known issues.
I may be able to nurse both vehicles at once, swapping between the two as I do repairs. The 3500 has all the parts already purchased except the cab corners. The Volvo will need a couple grand worth of parts to get it up to par.
Then I have the white diesel suburban that in theory just needs an engine to be close to 100%, so who knows, that may be the better choice overall. I am using the 3500 right now, I just can't start it if it is below 40 since it has no glow plugs or way to preheat the engine. I have just been using it during the day, then putting it back in the heated shop at night. Luckily I can drive the Ford plow truck, but it isn't ideal for anything except plowing and sanding.