Worth the effort? 1 Ton upgrade

[mcmlxix]

So I just got the Blazer this week. Needs some general maintenance: Fluids, column wiring, steering box and body mounts to start. Has a 4" lift with blocks in the rear and I will probably get the ORD shackle flip kit... I found a 1980 parts truck that has "heavy duty 1.5 ton axles" according to the owner and the local parts place that helped in replace the brakes.... I am guessing its a D60 and 14BFF... My question is - Do I need them? I dont plan on doing any hard core wheeling. Not even shore I will do much wheeling at all... I would like to run some 17" Hummer H2 wheels with the 315/70/17 tires but I can just upgrade the front and rear I have now.... Is it worth the extra effort, cost and weight?

My ultimate plan is an aluminum 6.0L/4L60e/NP205 combo to make a nice driver with a good MPG average that I can take off road if I want to. It has a factory POSI with 3.73 gears now....

I know its my descision in the end but I tend to go overboard.... some one keep me grounded....