Sorry I'm not going to read 3 pages, but below is what made me buy my MPII
1) Best bang for the buck ($700)
A) I'm not MIL or LE, so I don't need a rifle that has been analyzed under a microscope. As in Colt does this. And my everyday life doesn't depend on my rifle
B) I don't need a free floated barrel because I wont be shooting beyond 100yrds (KHSC), unless I get extra cash and want to make the rifle look cooler.
2) I was going to change some parts anyways (pistol grip, but stock, muzzle break) and these parts are cheap
3) I'm not going to use the rifle for hunting or precision shooting so the current factory grouping is acceptable
So in the end for me, why should I spend $1K on a colt and still have to spend money to change the parts above or $1400+ on a DD when I can buy 2 MPII's for that price? Or 1 MPII and have plenty of money for ammo and other accessories or training.
But OP, it's your money. You know what your goals are and what will make you happy. These rifles should last you at least 20 years, so you don't want any regrets.