If this link is to be believed:
http://www.nba.com/statistics/playoff_picture.html
... then it goes Dallas, Denver, Utah, Phoenix, if they're all tied at the end of the season.
I'm not sure if any of them play each other again before the end of the year, if so, that'd change things. On the conference records, it looks like Denver and Phoenix have the best records there.
I'd prefer the Blazers play either Dallas or Phoenix in the first round than Denver or Utah, but we'll see. It's a total toss-up, as far as I can tell.
The key is to get out of the 8th spot, obviously, and avoid the Lakers. Say what you will about Andre Miller's "market" comment, but it's very hard to beat LA in the first round.