Well, Florida has a trove of good young (former high draft picks) prospects ready to stake their claim on the NHL roster. They have Luongo in net, and have not won for so long that getting a player that can help them immediately, and some picks to groom for the future, might be a better option than one pick.
The most NHL ready player in this draft is 6'3" 215lb. Aaron Ekblad. Ekblad is a very good player, but he is not going to be a difference maker next year and will be lucky to get 12 min. of ice time per game on the Panthers' present roster.
Instead, Florida will trade the pick for some immediate help and picks. Who will they trade with? The most logical partner for them would be the NY Islanders.
The Islanders have solid prospects up front but no size on the back-end and no one with anywhere near the upside of Ekblad on their team. Further, the Islanders need this pick to start ASAP - they gave Buffalo their first round pick for 2015 and if it ends up being a high pick the team is going to be ripped mercilessly in the NY press and by their fan base just when they want everyone to focus on their move to Brooklyn and the Barclays Center. Getting immediate help is a must for the Islanders and trading for an established player that could flame or simply doesn't want to be part of a massive rebuild - see Thomas Vanek - well, they already tried that and had it blow up in their face. Thus, getting the most NHL ready prospect in this draft would be a coup for the Islanders.
The Panthers probably don't want to move down too far in the first round - rumor has it that they covet William Nylander, but he is not going to last past the fifth or sixth pick after his performance in the U-18 Championships. By trading down to the five spot Florida can still get Nylander and a solid role player that could help them out immediately.
If this happens the likelihood is that the first five picks in the draft will be Ekblad, Bennet, Reinhart, Draisatl and Nylander. That leaves Dal Colle, Ehlers, Virtanen and Ritchie as the most likely players to be available at that spot - that are worth drafting that high. Of these my favorites are Ehlers and Dal Colle as both represent the type of player that does not exist in the Canucks system right now.