So I finally bit the bullet and picked up a firearm, some 9 months after my original post. Sportsman's wearhouse was having a 6% off sale on all firearms and accessories. Picked up a Glock 22 (.40 caliber full-size), some rounds and ear & eye protection.
I looked at the H&K USP .40, and man that's a beautiful gun. I just couldn't justify spending the extra ~$250 on it. If I really enjoy shooting the Glock and want to upgrade in the future, that will definitely be on my short list.
I know what I'm doing this weekend.