Ok, here's what I voted for:
Electric Hammer - Face it; This set would be a blast. Sure, it seems a little obvious that its inspired by Thor, but it would do massive damage and include some pretty awesome FX. It can work for other types of characters, too, such as knights, barbarians, ect.
Psionic Weaponry - This set would could potentially combine many of the other listed choices into one set. A different type of weapon composed of psychic energy could be used for each attack, too. This offers a lot of variety. Perhaps with a more basic color scheme (such as a blue or white effect) it could be used to simulate other powers like 'soul energy' or 'hard light'.
Density Control - This set would be VERY interesting. It offers a chance for cool offensive and defensive power buffs that could be combined with any other melee primary. Imagine being able to disrupt electrical-based villains by decreasing your density, or doing a dose of extra damage by increasing your density. Phasing through attacks, much like the power pool set, could be included as a bonus.
Shield Defense - This could be combined with any other primary scrapper ability for a variety of choices. It could even feature an offensive shield attack or two. But really, a shield is a defensive weapon, which makes choosing it as a defensive power more sensible. I wonder if a choice in shield design could be made available, such as ancient, riot control, contemporary steel, or energy designs. Perhaps, though I'm not sure what this entails.
