For PvE Grouping, you're better off with something like this - PvE Group Bard
The +hit from Bladedancer will do more for you than the crit from Ranger or the attack power from riftstalker, as most pve bosses need extra hit. Also, by going 6 into Bladedancer, you can pick up Combat Pose, letting you buff up to 3 stats for your group. Suggested buffing then would be (assuming you have a cleric or warrior who is running a soul that can buff endurance) - Fanfare of Knowledge for the group and Combat Pose for people who use dex. If you have one of the warrior specs that can buff strength, in a balanced group you could conceivably be able to buff all the primary stats this way.