This post is intended for those poor lurkers who review this thread and may actually begin to think that there is ANY discernable difference between versions of the Evo.
Look at these threads and see if ANYONE has shown there to be a consistent difference between any two versions. Some claim the battery door is different or improved (we have no proof and many versions have no problem with the door in any case), some claim the battery is different (this has been disproved), some claim the screen is different (later screens might be, but the Evo version makes no difference), some claim the grounding issue is different (this has been disproved because it affects some and not others with all versions).
It boils down to this: There are plenty of opinions of folks who have convinced themselves that there is a difference in versions. There has been no proof that one version is different. In fact, just the opposite. Every time someone claims there is a difference, one of the owners of an early version states that their version has the claimed difference.
The happy fact, plain and simple, is that HTC appears to demonstrate better production quality as the Evo assembly progresses. Problems appear to be less and quality improved as the Evo become a bit more mature. This is what happens with assembly lines. But please understand that a version number means relatively little. You might have better luck with assembly quality, but the phone is no different. Don't waste your time on looking for the elusive version X. When you get your phone, look at it and check for problems that have been reported in ALL versions. Making sure it is a particular version is NOT going to guarantee you that your phone is even marginally DIFFERENT than an earlier phone.