I personally like number 5
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[i]Feint Lumeire[/i] (French for 'Light Feint') Solar Exotic Sword High speed, low impact Replace block with a parry that blocks all melee damage and staggers opponents Can attack 5 successive times as opposed to 3 Replace increased armor perk with increased agility RT to dash forward, piercing everything in your way (a bit further than the diameter of a control zone)
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That grenade laucher could change with each element Solar - Explosions catch emeies on fire Arc - Explosions blind enemies Void - Explosions disable all abilities and slows movement
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The top three seem completely useless, I'd change them or explain them.