If you do the hard trails, want to do them, or wheel with people who do, skip the junkyard. You won't find anything that will suit you that you wouldn't need to completely gut anyways. The 8.8 is fine if left close to stock with mild tires. It's a fantastic dana35 alternative, however, once you completely rebuild one with proper gears, locker/ superior kit you could have done something better particularly if you want to do a front swap. The 5 on 4.5 pattern leaves you without a matching front upgrade unless you are ok with adapters. Not implying that this is bad as ive done this. 5 on 4.5 to 8 lug adapters are very pricey so you'd want to stick with 5 on 5.5. Don't discount a custom built axle or even buying parts to build one. My first axle build was a Currie. They walked me through the process of picking parts and they sent it unassembled. It was a nice intro to axle building. Put a list together of the parts you would need for a junkyard swap and also another line for parts you would want for the axles. Add the cost of these and compare with an aftermarket unit. Also factor in all the time and personal labor of finding the housing you want. For me its no longer worth digging for simply an empty housing only to replace everything else. If a 14bolt was a potential then i might pull one of those from a yard. You can also check forums for people getting rid of 3/4 or 1 ton stuff when upgrading. There's often cool stuff listed on pirate.
-insert meaningless out-of-place political diatribe-