Please do not waste time trying to balance character classes/races/destinies as IT IS NOT NEEDED. There is NEVER going to be equality between the killing ability (which is what I assume you mean by 'power') of all builds. D&D is not a game where this type of balance has ever been possible or even desirable. Each character is not supposed to be a killing machine, they are supposed to be able to contribute to the success of the PARTY using their skills/abilities according to the role they play (healer, trap monkey, CC etc) not have everyone aiming to be top of the kill chart. If all that people desire is to be death dealers then everyone would simply play monks - or better yet play WOW.

D&D is about dungeon delving with a party setting out to achieve a goal - not about who kills the most. A healing spec'd cleric who keeps his party alive despite overwhelming mobs of monsters but does not achieve a single kill is many times more valuable (i.e. powerful) than an assassin that can kill with a glance.

DO NOT seek character balance - that is for lesser games which promote the stupidity of PvP (something which should not even exist in DDO). What you should be seeking is balance between the character builds which fulfil a similar ROLE so that each can feel they are able to contribute to that role despite their personal preferences for race/class/enhancement/destiny combinations. e.g. a healing spec'd FS (currently not possible - a failing in role balance between divine classes) should be able to achieve as much positive energy as a healing spec'd Cleric, and a Rogue/Artificer should be able to achieve a similarly high Spot skill as a Ranger (at the moment impossible as the Ranger has Wild Instincts on top of everything else while Rogues/Artis have no obvious way to boost their skill that high and thus can easily miss traps in EE dungeons).

Seek balance for well put together parties filling by characters that target a role, not individual players out to top the kill count. DDO is a group game and should not go the path of dumbing things down to the point where everyone solos their way through using the flavour of the month killing build.