96 Blazer coolant flush due?

Hello all, I have been reading on the forum about the Dex and the green stuff and don't know which one to use. Suggestions please! here's specs:

120k, dark brown antifreeze in the vehicle now. I think it's about time to change before the New England weather this year. Do I do a complete flush with eguine coolant cleaner or flush it with water only and which one would you suggest to replace it with? the greeen or Dex? I hear the dex isn't the cheapest either, but if I use the green I'll use a name brand. Thanks for your help/replies!

I'd give it a good flush with a good cleaner and make sure you flush with fresh water a few times after the main flush to remove as much of the cleaner and old coolant as possible. You won't get it all but each successive flush with fresh water will dilute whatever remains.
If your vehicle came with DexCool from the factory, I'd stick with it. Your engine components were made for the DexCool and damage could result from an ethylene glycol based coolant. Today's modern engines with their different metallic composition and other non-metallic parts require a different protection package that the OAT based DexCool offers. Why would you use a 20th century coolant in a 21st century engine? The problems that have been reported in the past that were thought to be related to the DexCool are actually a result of a number of items such as poor/improper maintenance, poor quality gasket materials and air infiltration into the cooling system. Properly maintaining your cooling system to include flushing and filling on a regular basis and checking your radiator cap can go a long way in ensuring a problem free cooling system.