Having carried a classic 1911 as a sidearm (and an M60 as my primary) WAY back when the best President EVER was in charge (Ronald Reagan), I too have an affinity for the 1911.
However, for military application, the HK and Sig lines bring a whole lot more to the table now-days than the trusty 1911. Namely, the number of rounds per mag.
Obviously, personal preference and bias carries no weight, or else the Beretta M9 would have been replaced long ago. Yet, it's still around and "winning" contracts time and again. I love 1911's too, but if I had my choice and I was going cave hopping, or room clearing, I'd want more than 8 rounds per mag. SOCOM has the right idea.
HK's are outstanding, just expensive. Sigs are expensive too. Both are "bullet-proof" in their design, reliability and capability on the modern battlefield.