Since I never commented on the old thread... the thing I just fail to get with the whole XD vs Glock thing is, they are so similar... of course, most folks will prefer one over the other, and maybe I'm just either jaded or easy to please, but they are similar enough in my experience to think that all personal biases aside, they are both excellent choices.
My gut instinct would be to say that brand new 4" HDs are cheaper than brand new Glock 19s and 23s... If budget is a primary concern, I'd certainly consider the XD over the Glock. With the smallest guns, the G26/27 feel more natural in my hand and when shooting than the subcompact XDs so I'd lean towards Glock in this segment though my experience is limited with the XDs. On the larger tactical guns, I'd start to lean back towards Glock as the aftermarket for race type accessories is basically limitless.
But all this is simply my impression... To the guys that seem to think that a Glock will blow up immediately upon removing it from the case, that's just silly... To the guys that think that the XD will somehor survive a nuclear attack and not even lose it's zero, that's just silly as well. Folks that would exclude the XD because it's price has gone up, that's the king of silly.
They are both among the finest choices of carry guns for people that embrace polymer guns, regardless of your preferences. The overwhelming majority of folks that buy an XD or a Glock and only shoot factory loaded copper clad ammo will have very few problems with their gun and those problems that do come along will be fixed quickly if you refrain from insulting the company when you talk to them about your problem.