Some Verizon phones, like the Blackberry Tour 9630, Bold 9650, Storm 9530, as well as the Droid 2 Global and the upcoming HTC Merge, have SIM slots even though the phone is mainly CDMA. The SIM is actually intended to be used with Vodafone SIMs, as Vodafone owns 49% of Verizon. I thought Verizon might be issuing SIMs for those traveling, so it can the phone can be used with any carrier in partner with Verizon for roaming.
If the phone can be unlocked, there is nothing stopping them from being used in any Asian or European carrier. I know, I got a Blackberry Tour 9630 with Verizon markings. Got it unlocked and working with any GSM SIM, and I sold the phone, which is now somewhere serving its new master in the Philippines, which is predominantly GSM.
As for the Desire Z, having owned one, I shouldn't worry about the hinge. It looks robust enough.
If you want a phone to be used outside of the US, its not hard to find unlocked Desire Z with Asian-Euro 900 2100 frequency. That would actually be my first choice.