Ok, we got three people saying they prefer PVE: Stix, Quickshot and Kemplar. Shoruken is undecided (his deciding factor being where everyone else goes), I don't care anymore (preferred PVP but I'd rather have two more people than be on a PVP server), Kelek doesn't care.
Stix, did you play on a PVE server at all during beta? If so, how often did you see PVP flagged players? I don't want to play on PVE if PVP is rare. I guess you could always instigate PVP by going to enemy lands and killing their NPC's.
Once battlegrounds are put in, there really won't be any point to playing on a PVP server though. Here's a good article that Shoruken found that makes a good argument against playing on a PVP server.
As for timezone, I still say Mountain. Everyone else is either in Mountain or Pacific at this point. Stix, is your clan still deciding to play a Pacific server in the off chance your friend in Japan will play? If not, and we choose Mountain, maybe we could all be on the same server.