If you want to try a full bard spec I recommend this build http://rift.zam.com/en/stc.html?t=0MNci..EIdqiqskqz.Vh
Full 51 points in Bard. and 8 in nightblade. The 8 in nightblade increases the damage of your cadence, which in turn effects its healing properties. The 3rd soul is just an optional ranger for the pet, but no points spent in it. I find in an excellent build, extremely capable in Rift raids and can heal instances pretty well. Bards are designed as group healers/buffers though, and if doing a tough instance you will sometimes need a backup healer for the main tank.