In DarnUI there al option to use a crosshair in 3rd person view but the problem with it is that it's actually quite a bit lower then it should be so then aiming you have to aim above what it is your trying to hit, soo my question is, is there a way in raising it so it's above the head of the PC or is there a crosshair mod which has already address this?

Id suggest download Ultimate 3rd Person Camera but its not compatable with any mods that change the "skeleton.nif"(Deadly Reflexes 6.0, many animation mods.
Its a really excellent mod: http://tesnexus.com/downloads/file.php?id=29942