I'd go dark/willpower instead, personally. Out of the box on SOs Willpower's two weaknesses are to large spike damage like an alpha (which regen is worse at out of the box) and a lack of a self heal if their regeneration isn't enough. Dark melee plugs the second hole fairly well... and dark's negative to hit, which is great for any armor set, stacks with the defense value of Heightened Senses nicely. Once you floor the enemies accuracy both sets are great... but I feel that Willpower, outside of moment and glory or instant healing being active, will be better at surviving getting the enemy to that point.
Weight training: Because you'll never hear someone lament "If only I were weaker, I could have saved them."
Thanks for the input there, was unsure if /regen was the way to go, now I know better 
So Dark/Will it is then, thank you.
So the mission has changed folks! SO levelling build for Dark/Will!
I'm considering making a new scrapper as my current one has lost alot of the sparkle, so to speak, plus the all lethal damage is sooo annoying. So I was pondering the above Dark/Regen scrapper, does the combination work well at all? If not what would work better next to Dark, other than /dark ofcourse.
And I was also curious if anyone would be so kind as to post up a viable SO levelling build for the toon as I don't generally turn to IO sets until 30-35.