For a melee solo build, I've had great success with this (stopped with points at your lvl 21) http://rift.zam.com/en/stc.html?t=0Mipc.iIzM.L.xc
from there on out, i mix in rift and nb with more in nb for dps and the rift for some endurance, more plane shift and armor bonus for survival. I can solo 3-4 same lvl mobs without to much trouble. The hp with kill on unused combo points makes for almost no down time unless I pull to many mobs and am just trying to survive.
This is close to what Im at at 40 (without checking my toon) and I will likely put a few more into bard (for a bit more healing as these lvl 40 mobs do hit kinda hard) and the rest into NB. http://rift.zam.com/en/stc.html?t=0Mipc.iItM0oGM.tchh0o.xc
You could make a ranged version with ranger/marks/bard or ranger/sab/bard for a good ranged solo build, but Im a melee guy and it keeps me on my toes with this build at least a bit.
For pure dps, I have been using a NB/Sin/BladeD with 6 into BD for the dex buff and the 31 pt talent into NB..havent perfected that one by any means, but it hits pretty hard combining expose weakness, and a NB opener from stealth and a mix of finishers.
Hope it helps, and please any one else, let me know if these look ok to you :)