With a handful votes in so far, the Carolina Hurricanes are the most desired opponent. Which is good, because as of today, they are in fifth place, winning a big game in Florida last night. Pittsburgh is only a point behind with a game in hand, but fifth is fifth.
The Flyers went 3-0-1 against the Hurricanes this season, playing all four games within the span of a couple weeks in late November and early December. Carolina, you'll recall, couldn't even beat the Flyers when they led 5-1 after two periods.
At the risk of getting ahead of myself, I think it's pretty clear that if the Flyers do meet the 'Canes in Round 1, sweep will be the word.