How strong can these axles be with axle truss's and axles upgrades with ARB lockers front and rear? Should I just upgrade to larger axles from the get go? Will it be a problem if I'm running 30 spline axles in front and 27 spline in rear? Should they be the same? If you do have 30 in the front and 27 in the rear will that just make the rear spin a bit faster that the front? Also I will be running 35x12.5" tires

Super 30 axle kit with ARB locker:
http://rustysoffroad.com/mm5/merchan...egory_Code=AXL

Super 35 axle kit with ARB locker:
http://www.rocky-road.com/xjaxle.html

The total of both kits would only be $2364 before shipping which doesnt seem that bad. With upgrades like these would I still need to be worried about breakage with 35x12.5" tires.

Or should I just go all out with the following:
Rear dana 44 setup:
http://www.4wheelparts.com/Drivetrai...%2f2D44TJ-A456

Front dana 44 setup:
http://www.4wheelparts.com/Drivetrai...2f2D44TJ-FA456

And I will be going with a hi steer setup also no matter which way I decide to go.

The front would be fine and spline count has nothing to do with how fast they turn, that's the ring and pinion. I ran alloy shafts in a 35 with 33s and snapped them like tooth pics. If you plan on spending the cash spend it on something that will last.

Trussing a turdy five is like trussing a toothpick, and building one is like polishing a turd. Get a 44, or a Ford 8.8 from a 96+ Explorer.